diff --git a/Source/NSKVOSupport.m b/Source/NSKVOSupport.m
index ea511986e..d5f88074b 100644
--- a/Source/NSKVOSupport.m
+++ b/Source/NSKVOSupport.m
@@ -720,7 +720,10 @@ + (NSSet *) keyPathsForValuesAffectingValueForKey: (NSString *)key
           free(selectorName);
         }
 
-      return ((NSSet *(*)(id, SEL))objc_msgSend)(self, sel);
+      if ([self respondsToSelector:sel])
+        {
+          return ((NSSet *(*)(id, SEL))objc_msgSend)(self, sel);
+        }
     }
   return emptySet;
 }