diff --git a/std/player/protocols/gmcp.c b/std/player/protocols/gmcp.c
index 6ac60dc..676dde4 100644
--- a/std/player/protocols/gmcp.c
+++ b/std/player/protocols/gmcp.c
@@ -491,9 +491,9 @@
   string sh=process_string(environment()->QueryProp(P_INT_SHORT)||"");
   switch(sh[<1])
   {
-    case ".":
-    case "!":
-    case "?":
+    case '.':
+    case '!':
+    case '?':
       break;
     default:
       sh+=".";