diff --git a/Source/NSURLProtectionSpace.m b/Source/NSURLProtectionSpace.m
index e739a400a..cf321c49d 100644
--- a/Source/NSURLProtectionSpace.m
+++ b/Source/NSURLProtectionSpace.m
@@ -162,7 +162,7 @@ authenticationMethod: (NSString *)authenticationMethod
 
 - (unsigned) isEqual: (id)other
 {
-  if ([other isKindOfClass: [NSURLProtocol class]] == NO)
+  if ([other isKindOfClass: [NSURLProtectionSpace class]] == NO)
     {
       return NO;
     }