diff --git a/CHANGELOG.md b/CHANGELOG.md
index 6ab781a04..112b0c8cc 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,7 @@ Please, check out guidelines: https://keepachangelog.com/en/1.0.0/
 
 ### Fixed
 
+- Fix `tuist build` building a wrong workspace [#1427](https://github.com/tuist/tuist/pull/1427) by [@fortmarek](https://github.com/fortmarek)
 - `tuist edit` always creates a project in a new temp dir [#1424](https://github.com/tuist/tuist/pull/1424) by [@fortmarek](https://github.com/fortmarek)
 - Fix `tuist init` and `tuist scaffold` with new ArgumentParser version [#1425](https://github.com/tuist/tuist/pull/1425) by [@fortmarek](https://github.com/fortmarek)
 - `--clean` argument ot the build command [#1421](https://github.com/tuist/tuist/pull/1421) by [@pepibumur](https://github.com/pepibumur)
diff --git a/Sources/TuistAutomation/Utilities/BuildGraphInspector.swift b/Sources/TuistAutomation/Utilities/BuildGraphInspector.swift
index b5825b23e..b289c87e9 100644
--- a/Sources/TuistAutomation/Utilities/BuildGraphInspector.swift
+++ b/Sources/TuistAutomation/Utilities/BuildGraphInspector.swift
@@ -1,6 +1,7 @@
 import Foundation
 import TSCBasic
 import TuistCore
+import TuistSupport
 
 public protocol BuildGraphInspecting {
     /// Returns the build arguments to be used with the given target.
@@ -10,7 +11,7 @@ public protocol BuildGraphInspecting {
 
     /// Given a directory, it returns the first .xcworkspace found.
     /// - Parameter path: Found .xcworkspace.
-    func workspacePath(directory: AbsolutePath) -> AbsolutePath?
+    func workspacePath(directory: AbsolutePath) throws -> AbsolutePath?
 
     ///  From the list of buildable targets of the given scheme, it returns the first one.
     /// - Parameters:
@@ -62,7 +63,13 @@ public class BuildGraphInspector: BuildGraphInspecting {
             .sorted(by: { $0.name < $1.name })
     }
 
-    public func workspacePath(directory: AbsolutePath) -> AbsolutePath? {
-        directory.glob("**/*.xcworkspace").first
+    public func workspacePath(directory: AbsolutePath) throws -> AbsolutePath? {
+        try directory.glob("**/*.xcworkspace")
+            .filter {
+                try FileHandler.shared.contentsOfDirectory($0)
+                    .map(\.basename)
+                    .contains(Constants.tuistGeneratedFileName)
+            }
+            .first
     }
 }
diff --git a/Sources/TuistGenerator/Generator/WorkspaceGenerator.swift b/Sources/TuistGenerator/Generator/WorkspaceGenerator.swift
index 5793dc2ef..eb89dbb5d 100644
--- a/Sources/TuistGenerator/Generator/WorkspaceGenerator.swift
+++ b/Sources/TuistGenerator/Generator/WorkspaceGenerator.swift
@@ -123,12 +123,14 @@ final class WorkspaceGenerator: WorkspaceGenerating {
                                                                     generatedProjects: generatedProjects,
                                                                     graph: graph)
 
-        return WorkspaceDescriptor(path: path,
-                                   xcworkspacePath: workspacePath,
-                                   xcworkspace: xcWorkspace,
-                                   projectDescriptors: projects,
-                                   schemeDescriptors: schemes,
-                                   sideEffectDescriptors: [])
+        return WorkspaceDescriptor(
+            path: path,
+            xcworkspacePath: workspacePath,
+            xcworkspace: xcWorkspace,
+            projectDescriptors: projects,
+            schemeDescriptors: schemes,
+            sideEffectDescriptors: []
+        )
     }
 
     /// Create a XCWorkspaceDataElement.file from a path string.
diff --git a/Sources/TuistKit/ProjectGenerator/ProjectGenerator.swift b/Sources/TuistKit/ProjectGenerator/ProjectGenerator.swift
index cad96abc8..c4962b76c 100644
--- a/Sources/TuistKit/ProjectGenerator/ProjectGenerator.swift
+++ b/Sources/TuistKit/ProjectGenerator/ProjectGenerator.swift
@@ -124,7 +124,7 @@ class ProjectGenerator: ProjectGenerating {
 
     private func generateProjectWorkspace(path: AbsolutePath) throws -> (AbsolutePath, Graph) {
         // Load
-        let (project, graph, sideEffects) = try loadProject(path: path)
+        let (project, graph, sideEffects) = try loadProjectWorkspace(path: path)
 
         // Lint
         try lint(graph: graph)
@@ -191,6 +191,23 @@ class ProjectGenerator: ProjectGenerating {
         return (project, updatedGraph, modelMapperSideEffects + graphMapperSideEffects)
     }
 
+    private func loadProjectWorkspace(path: AbsolutePath) throws -> (Project, Graph, [SideEffectDescriptor]) {
+        // Load project
+        let (project, graph, sideEffects) = try loadProject(path: path)
+
+        /// Used to disambiguate which workspaces are generated by tuist and which are not
+        let tuistGeneratedFileDescriptor = FileDescriptor(
+            path: project.path.appending(components: "\(project.name).xcworkspace", Constants.tuistGeneratedFileName)
+        )
+
+        /// Additional side effects
+        let additionalSideEffects: [SideEffectDescriptor] = [
+            .file(tuistGeneratedFileDescriptor),
+        ]
+
+        return (project, graph, sideEffects + additionalSideEffects)
+    }
+
     private func loadWorkspace(path: AbsolutePath) throws -> (Workspace, Graph, [SideEffectDescriptor]) {
         // Load all manifests
         let manifests = try recursiveManifestLoader.loadWorkspace(at: path)
@@ -220,7 +237,17 @@ class ProjectGenerator: ProjectGenerating {
         // Apply graph mappers
         let (updatedGraph, graphMapperSideEffects) = try graphMapperProvider.mapper(config: config).map(graph: graph)
 
-        return (workspace, updatedGraph, modelMapperSideEffects + graphMapperSideEffects)
+        /// Used to disambiguate which workspaces are generated by tuist and which are not
+        let tuistGeneratedFileDescriptor = FileDescriptor(
+            path: workspace.path.appending(components: "\(workspace.name).xcworkspace", Constants.tuistGeneratedFileName)
+        )
+
+        /// Additional side effects
+        let additionalSideEffects: [SideEffectDescriptor] = [
+            .file(tuistGeneratedFileDescriptor),
+        ]
+
+        return (workspace, updatedGraph, modelMapperSideEffects + graphMapperSideEffects + additionalSideEffects)
     }
 
     private func convert(manifests: LoadedProjects,
diff --git a/Sources/TuistKit/Services/BuildService.swift b/Sources/TuistKit/Services/BuildService.swift
index 6a0d7c868..0715097de 100644
--- a/Sources/TuistKit/Services/BuildService.swift
+++ b/Sources/TuistKit/Services/BuildService.swift
@@ -50,7 +50,7 @@ final class BuildService {
 
     func run(schemeName: String?, generate: Bool, clean: Bool, configuration: String?, path: AbsolutePath) throws {
         let graph: Graph
-        if generate || buildGraphInspector.workspacePath(directory: path) == nil {
+        if try (generate || buildGraphInspector.workspacePath(directory: path) == nil) {
             graph = try projectGenerator.generateWithGraph(path: path, projectOnly: false).1
         } else {
             graph = try projectGenerator.load(path: path)
@@ -82,7 +82,7 @@ final class BuildService {
         guard let buildableTarget = buildGraphInspector.buildableTarget(scheme: scheme, graph: graph) else {
             throw BuildServiceError.schemeWithoutBuildableTargets(scheme: scheme.name)
         }
-        let workspacePath = buildGraphInspector.workspacePath(directory: path)!
+        let workspacePath = try buildGraphInspector.workspacePath(directory: path)!
         _ = try xcodebuildController.build(.workspace(workspacePath),
                                            scheme: scheme.name,
                                            clean: clean,
diff --git a/Sources/TuistSupport/Constants.swift b/Sources/TuistSupport/Constants.swift
index 7d1c20346..beea78aa1 100644
--- a/Sources/TuistSupport/Constants.swift
+++ b/Sources/TuistSupport/Constants.swift
@@ -15,6 +15,7 @@ public struct Constants {
     public static let templatesDirectoryName: String = "Templates"
     public static let twitterHandle: String = "tuistio"
     public static let joinSlackURL: String = "https://slack.tuist.io/"
+    public static let tuistGeneratedFileName = ".tuist-generated"
 
     public struct EnvironmentVariables {
         public static let colouredOutput = "TUIST_COLOURED_OUTPUT"
diff --git a/Tests/TuistAutomationTests/Utilities/BuildGraphInspectorTests.swift b/Tests/TuistAutomationTests/Utilities/BuildGraphInspectorTests.swift
index eeeae6cb0..ce8693f1b 100644
--- a/Tests/TuistAutomationTests/Utilities/BuildGraphInspectorTests.swift
+++ b/Tests/TuistAutomationTests/Utilities/BuildGraphInspectorTests.swift
@@ -166,10 +166,40 @@ final class BuildGraphInspectorTests: TuistUnitTestCase {
         // Given
         let path = try temporaryPath()
         let workspacePath = path.appending(component: "App.xcworkspace")
-        try FileHandler.shared.touch(workspacePath)
+        try FileHandler.shared.createFolder(workspacePath)
+        try FileHandler.shared.touch(workspacePath.appending(component: Constants.tuistGeneratedFileName))
 
         // When
-        let got = subject.workspacePath(directory: path)
+        let got = try subject.workspacePath(directory: path)
+
+        // Then
+        XCTAssertEqual(got, workspacePath)
+    }
+
+    func test_workspacePath_when_no_tuist_workspace_is_present() throws {
+        // Given
+        let path = try temporaryPath()
+        let workspacePath = path.appending(component: "App.xcworkspace")
+        try FileHandler.shared.createFolder(workspacePath)
+
+        // When
+        let got = try subject.workspacePath(directory: path)
+
+        // Then
+        XCTAssertNil(got)
+    }
+
+    func test_workspacePath_when_multiple_workspaces_are_present() throws {
+        // Given
+        let path = try temporaryPath()
+        let nonTuistWorkspacePath = path.appending(components: "SPM.xcworkspace")
+        try FileHandler.shared.createFolder(nonTuistWorkspacePath)
+        let workspacePath = path.appending(component: "TuistApp.xcworkspace")
+        try FileHandler.shared.createFolder(workspacePath)
+        try FileHandler.shared.touch(workspacePath.appending(component: Constants.tuistGeneratedFileName))
+
+        // When
+        let got = try subject.workspacePath(directory: path)
 
         // Then
         XCTAssertEqual(got, workspacePath)