diff --git a/clang/lib/Frontend/InitPreprocessor.cpp b/clang/lib/Frontend/InitPreprocessor.cpp
index 64128df..493144f 100644
--- a/clang/lib/Frontend/InitPreprocessor.cpp
+++ b/clang/lib/Frontend/InitPreprocessor.cpp
@@ -14,6 +14,7 @@
 #include "clang/Basic/FileManager.h"
 #include "clang/Basic/MacroBuilder.h"
 #include "clang/Basic/SourceManager.h"
+#include "clang/Basic/SyncScope.h"
 #include "clang/Basic/TargetInfo.h"
 #include "clang/Basic/Version.h"
 #include "clang/Frontend/FrontendDiagnostic.h"
@@ -575,6 +576,18 @@
   Builder.defineMacro("__ATOMIC_ACQ_REL", "4");
   Builder.defineMacro("__ATOMIC_SEQ_CST", "5");
 
+  // Define macros for the OpenCL memory scope.
+  // The values should match clang SyncScope enum.
+  assert(static_cast<unsigned>(SyncScope::OpenCLWorkGroup) == 1 &&
+         static_cast<unsigned>(SyncScope::OpenCLDevice) == 2 &&
+         static_cast<unsigned>(SyncScope::OpenCLAllSVMDevices) == 3 &&
+         static_cast<unsigned>(SyncScope::OpenCLSubGroup) == 4);
+  Builder.defineMacro("__OPENCL_MEMORY_SCOPE_WORK_ITEM", "0");
+  Builder.defineMacro("__OPENCL_MEMORY_SCOPE_WORK_GROUP", "1");
+  Builder.defineMacro("__OPENCL_MEMORY_SCOPE_DEVICE", "2");
+  Builder.defineMacro("__OPENCL_MEMORY_SCOPE_ALL_SVM_DEVICES", "3");
+  Builder.defineMacro("__OPENCL_MEMORY_SCOPE_SUB_GROUP", "4");
+
   // Support for #pragma redefine_extname (Sun compatibility)
   Builder.defineMacro("__PRAGMA_REDEFINE_EXTNAME", "1");