diff --git a/clang/include/clang/Basic/DiagnosticKinds.def b/clang/include/clang/Basic/DiagnosticKinds.def
index d1c4bd9080e8..ee8e33439af4 100644
--- a/clang/include/clang/Basic/DiagnosticKinds.def
+++ b/clang/include/clang/Basic/DiagnosticKinds.def
@@ -675,7 +675,7 @@ DIAG(err_attr_wrong_decl, ERROR,
      
 // Clang-Specific Attributes
 DIAG(err_attribute_iboutlet_non_ivar, ERROR,
-     "'IBOutlet' attribute can only be applied to instance variables")
+     "'iboutlet' attribute can only be applied to instance variables")
 
 // Function Parameter Semantic Analysis.
 DIAG(err_param_with_void_type, ERROR,