diff --git a/src/v8globals.h b/src/v8globals.h
index d11bc38331..e44b9e742e 100644
--- a/src/v8globals.h
+++ b/src/v8globals.h
@@ -472,7 +472,11 @@ enum CpuFeature { SSE4_1 = 32 + 19,  // x86
 // The Strict Mode (ECMA-262 5th edition, 4.2.2).
 enum StrictModeFlag {
   kNonStrictMode,
-  kStrictMode
+  kStrictMode,
+  // This value is never used, but is needed to prevent GCC 4.5 from failing
+  // to compile when we assert that a flag is either kNonStrictMode or
+  // kStrictMode.
+  kInvalidStrictFlag
 };
 
 } }  // namespace v8::internal