diff --git a/basis/images/loader/gtk/gtk.factor b/basis/images/loader/gtk/gtk.factor
index 9204b64442..1cf39e6885 100644
--- a/basis/images/loader/gtk/gtk.factor
+++ b/basis/images/loader/gtk/gtk.factor
@@ -10,7 +10,7 @@ SPECIALIZED-ARRAY: uchar
 
 SINGLETON: gtk-image
 
-os linux ? [
+os linux? [
     "png"  gtk-image register-image-class
     "tif"  gtk-image register-image-class
     "tiff" gtk-image register-image-class