diff --git a/polly/lib/CodeGen/PPCGCodeGeneration.cpp b/polly/lib/CodeGen/PPCGCodeGeneration.cpp
index e28088e803fc..dc5f56f0b2ed 100644
--- a/polly/lib/CodeGen/PPCGCodeGeneration.cpp
+++ b/polly/lib/CodeGen/PPCGCodeGeneration.cpp
@@ -92,12 +92,15 @@ private:
   ///   - Kernel:        A GPU kernel call (TODO)
   ///   - Data-Transfer: A GPU <-> CPU data-transfer (TODO)
   ///
-  virtual void createUser(__isl_take isl_ast_node *User) {
-    isl_ast_node_free(User);
-    return;
-  }
+  /// @param UserStmt The ast node to generate code for.
+  virtual void createUser(__isl_take isl_ast_node *UserStmt);
 };
 
+void GPUNodeBuilder::createUser(__isl_take isl_ast_node *UserStmt) {
+  isl_ast_node_free(UserStmt);
+  return;
+}
+
 namespace {
 class PPCGCodeGeneration : public ScopPass {
 public: