diff --git a/llvm/lib/CodeGen/RegAllocFast.cpp b/llvm/lib/CodeGen/RegAllocFast.cpp
index 6c2e60b..e92dbd2 100644
--- a/llvm/lib/CodeGen/RegAllocFast.cpp
+++ b/llvm/lib/CodeGen/RegAllocFast.cpp
@@ -144,7 +144,7 @@
     // not be erased.
     bool isBulkSpilling;
 
-    enum {
+    enum LLVM_ENUM_INT_TYPE(unsigned) {
       spillClean = 1,
       spillDirty = 100,
       spillImpossible = ~0u