diff --git a/Source/NSButtonCell.m b/Source/NSButtonCell.m
index c3e42cd4f..8284fb6dd 100644
--- a/Source/NSButtonCell.m
+++ b/Source/NSButtonCell.m
@@ -77,6 +77,8 @@
   _delayInterval = 0.4;
   _repeatInterval = 0.075;
   _keyEquivalentModifierMask = NSCommandKeyMask;
+  _keyEquivalent = @"";
+  _altContents = @"";
 
   return self;
 }