--- a/src/callbacks.h
+++ b/src/callbacks.h
@@ -26,7 +26,7 @@
     \ingroup gerbv
 */
 
-enum {
+enum CALLBACKS_SAVE_FILE_TYPE {
 	CALLBACKS_SAVE_PROJECT_AS,
 	CALLBACKS_SAVE_FILE_PS,
 	CALLBACKS_SAVE_FILE_PDF,
@@ -41,13 +41,13 @@
 	CALLBACKS_SAVE_LAYER_AS,
 	CALLBACKS_SAVE_FILE_IDRILL
 	
-} CALLBACKS_SAVE_FILE_TYPE;
+};
 
-enum {
+enum toggle_layer {
 	LAYER_SELECTED =	-1,
 	LAYER_ALL_ON =		-2,
 	LAYER_ALL_OFF =		-3,
-} toggle_layer;
+};
 
 void
 callbacks_new_project_activate                (GtkMenuItem     *menuitem,