diff --git a/autoload/showmap.vim b/autoload/showmap.vim
index 63793df..52576b7 100644
--- a/autoload/showmap.vim
+++ b/autoload/showmap.vim
@@ -163,17 +163,17 @@ function! showmap#autobind(modes)
         if !has_key(binds, lhs_prefix)
           " don't overwrite map if one exists
           if maparg(lhs_prefix, mode) == ''
-            if !exists('g:showmap_autobind_exceptions["'.mode.'"]["'.lhs_prefix.'"]')
-              if (!exists('s:autobind_default_exceptions["'.mode.'"]["'.lhs_prefix.'"]')
+            if !exists("g:showmap_autobind_exceptions['".mode."']['".lhs_prefix."']")
+              if (!exists("s:autobind_default_exceptions['".mode."']['".lhs_prefix."']")
                   \ || exists('g:showmap_no_autobind_default_exceptions'))
                 " the binding is created here
                 call showmap#bind_helper(lhs_prefix, mode)
                 call s:log2file("showmap#bind_helper(".lhs_prefix.','.mode.')')
               else
-                call s:log2file('  autobind_default_exceptions["'.mode.'"]["'.lhs_prefix.'"]')
+                call s:log2file("  autobind_default_exceptions['".mode."']['".lhs_prefix."']")
               endif
             else
-              call s:log2file('  autobind_exceptions["'.mode.'"]["'.lhs_prefix.'"]')
+              call s:log2file("  autobind_exceptions['".mode."']['".lhs_prefix."']")
             endif
           endif
           let binds[lhs_prefix] = 1