diff --git a/configure.in b/configure.in
index 0cb93e74..9f02f4fb 100644
--- a/configure.in
+++ b/configure.in
@@ -395,7 +395,7 @@ irssi.spec)
 
 echo
 
-if test "$GUI_LIBS" != "x"; then
+if test "x$GUI_LIBS" != "x"; then
   echo Building GTK frontend ...... : yes
 else
   echo Building GTK frontend ...... : no