diff --git a/AppKit/CPTextView/CPTextView.j b/AppKit/CPTextView/CPTextView.j
index 894390de2..39f8fb883 100644
--- a/AppKit/CPTextView/CPTextView.j
+++ b/AppKit/CPTextView/CPTextView.j
@@ -475,6 +475,9 @@ var kDelegateRespondsTo_textShouldBeginEditing
     if (!stringForPasting)
         return;
 
+    if (![stringForPasting isKindOfClass:[CPAttributedString class]])
+        stringForPasting = [[CPAttributedString alloc] initWithString:stringForPasting attributes:nil];
+
     var shouldUseSmartPasting = [self _shouldUseSmartPasting];
 
     if (shouldUseSmartPasting)