diff --git a/src/os_vms_conf.h b/src/os_vms_conf.h
index df03b15..64f5d6d 100644
--- a/src/os_vms_conf.h
+++ b/src/os_vms_conf.h
@@ -208,7 +208,7 @@
 
 // GUI support defines
 #if defined(FEAT_GUI_MOTIF) || defined(FEAT_GUI_GTK)
-#define X_INCLUDE_GRP_H             // To use getgrgid
+#define X_INCLUDE_GRP_H		// To use getgrgid
 #define XUSE_MTSAFE_API
 #define HAVE_X11
 #define WANT_X11