diff --git a/runtime/autoload/rubycomplete.vim b/runtime/autoload/rubycomplete.vim
index 440dfd4..40b87f4 100644
--- a/runtime/autoload/rubycomplete.vim
+++ b/runtime/autoload/rubycomplete.vim
@@ -196,7 +196,7 @@
             if c =~ '\w'
                 continue
             elseif ! c =~ '\.'
-                idx = -1
+                let idx = -1
                 break
             else
                 break