diff --git a/unittests/ADT/ValueMapTest.cpp b/unittests/ADT/ValueMapTest.cpp
index 9159657..451e30a 100644
--- a/unittests/ADT/ValueMapTest.cpp
+++ b/unittests/ADT/ValueMapTest.cpp
@@ -11,6 +11,7 @@
 #include "llvm/Instructions.h"
 #include "llvm/LLVMContext.h"
 #include "llvm/ADT/OwningPtr.h"
+#include "llvm/Config/config.h"
 
 #include "gtest/gtest.h"
 
@@ -193,6 +194,7 @@
   }
   static sys::Mutex *getMutex(const ExtraData &Data) { return Data.M; }
 };
+#if ENABLE_THREADS
 TYPED_TEST(ValueMapTest, LocksMutex) {
   sys::Mutex M(false);  // Not recursive.
   bool CalledRAUW = false, CalledDeleted = false;
@@ -205,6 +207,7 @@
   EXPECT_TRUE(CalledRAUW);
   EXPECT_TRUE(CalledDeleted);
 }
+#endif
 
 template<typename KeyT>
 struct NoFollow : ValueMapConfig<KeyT> {