gistfile1.txt

diff --git a/app/Classes/HiraganyController.m b/app/Classes/HiraganyController.m
index 141b3ea..fac3ca7 100644
--- a/app/Classes/HiraganyController.m
+++ b/app/Classes/HiraganyController.m
@@ -121,7 +121,10 @@
             converter.katakana = YES;
         }
     }
-    
+    if (flags & NSControlKeyMask) {
+        return NO;
+    }
+
     if ([self appendString:string sender:sender])
         return YES;