diff --git a/src/lib/subs/mission.c b/src/lib/subs/mission.c
index 0430f192..aaf00c61 100644
--- a/src/lib/subs/mission.c
+++ b/src/lib/subs/mission.c
@@ -895,7 +895,7 @@ oprange(struct empobj *gp, int *radius)
 	    range = ((struct plnstr *)gp)->pln_range / 2;
 	break;
     default:
-	CANT_HAPPEN("bad TYPE");
+	CANT_REACH();
 	range = -1;
     }