--- a/old-configure.in
+++ b/old-configure.in
@@ -4534,21 +4534,21 @@ dnl = Mac bundle name prefix
 dnl ========================================================
 MOZ_ARG_WITH_STRING(macbundlename-prefix,
 [  --with-macbundlename-prefix=prefix
                           Prefix for MOZ_MACBUNDLE_NAME],
 [ MOZ_MACBUNDLE_NAME_PREFIX="$withval"])
 
 MOZ_MACBUNDLE_NAME=$MOZ_APP_DISPLAYNAME
 if test "$MOZ_MACBUNDLE_NAME_PREFIX"; then
-  MOZ_MACBUNDLE_NAME="${MOZ_MACBUNDLE_NAME_PREFIX} ${MOZ_MACBUNDLE_NAME}"
+  MOZ_MACBUNDLE_NAME="${MOZ_MACBUNDLE_NAME_PREFIX}${MOZ_MACBUNDLE_NAME}"
 fi
 
 if test "$MOZ_DEBUG"; then
-  MOZ_MACBUNDLE_NAME="${MOZ_MACBUNDLE_NAME} Debug.app"
+  MOZ_MACBUNDLE_NAME="${MOZ_MACBUNDLE_NAME}Debug.app"
 else
   MOZ_MACBUNDLE_NAME=${MOZ_MACBUNDLE_NAME}.app
 fi
 AC_SUBST(MOZ_MACBUNDLE_NAME)
 
 dnl Mac bundle identifier (based on MOZ_APP_DISPLAYNAME)
 # If the MOZ_MACBUNDLE_ID is defined in the configure.sh, use it
 # Otherwise, use MOZ_APP_DISPLAYNAME