diff --git a/llvm/lib/ExecutionEngine/JIT/JIT.cpp b/llvm/lib/ExecutionEngine/JIT/JIT.cpp
index 413308c3df89..f57de179c501 100644
--- a/llvm/lib/ExecutionEngine/JIT/JIT.cpp
+++ b/llvm/lib/ExecutionEngine/JIT/JIT.cpp
@@ -489,8 +489,6 @@ void *JIT::getPointerToFunction(Function *F) {
   if (void *Addr = getPointerToGlobalIfAvailable(F))
     return Addr;   // Check if function already code gen'd
 
-  MutexGuard locked(lock);
-
   // Make sure we read in the function if it exists in this Module.
   if (F->hasNotBeenReadFromBitcode()) {
     // Determine the module provider this function is provided by.
@@ -516,6 +514,8 @@ void *JIT::getPointerToFunction(Function *F) {
     return Addr;
   }
 
+  MutexGuard locked(lock);
+
   if (F->isDeclaration()) {
     void *Addr = getPointerToNamedFunction(F->getName());
     addGlobalMapping(F, Addr);