diff --git a/src/trap.c b/src/trap.c
index 70187849c..a33b2b35f 100644
--- a/src/trap.c
+++ b/src/trap.c
@@ -3117,7 +3117,7 @@ mintrap(register struct monst *mtmp)
            Recognizing who made the trap isn't completely
            unreasonable; everybody has their own style. */
         if (trap->madeby_u && rnl(5))
-            setmangry(mtmp, TRUE);
+            setmangry(mtmp, FALSE);
 
         return trapeffect_selector(mtmp, trap, 0);
     }