diff --git a/tools/voice.pl b/tools/voice.pl
index 7d6f84ec4a..83b33c0c43 100755
--- a/tools/voice.pl
+++ b/tools/voice.pl
@@ -130,7 +130,11 @@ sub correct_string {
         $string =~ s/ID3/I D 3/g;
 
         case "english" {
-            $string =~ s/plugin(s?)/plug-in$1/ig;
+            switch($$tts_object{"name"}) {
+                case "festival" {
+                    $string =~ s/plugin(s?)/plug-in$1/ig;
+                }
+            }
         }
         case "deutsch" {
             # for all german engines (e.g. for english words)