diff --git a/Headers/Foundation/NSObjCRuntime.h b/Headers/Foundation/NSObjCRuntime.h
index 2703a385e..6a3cba95f 100644
--- a/Headers/Foundation/NSObjCRuntime.h
+++ b/Headers/Foundation/NSObjCRuntime.h
@@ -292,7 +292,7 @@ typedef NS_ENUM(NSInteger, NSComparisonResult)
   NSOrderedAscending = (NSInteger)-1, NSOrderedSame, NSOrderedDescending
 };
 
-enum {NSNotFound = NSIntegerMax};
+static const NSInteger NSNotFound = NSIntegerMax;
 
 DEFINE_BLOCK_TYPE(NSComparator, NSComparisonResult, id, id);