diff --git a/src/trap.c b/src/trap.c
index a97706fe8..0358e3520 100644
--- a/src/trap.c
+++ b/src/trap.c
@@ -2698,9 +2698,6 @@ trapeffect_rolling_boulder_trap(
                     trap->tseen = TRUE;
                 if (DEADMONSTER(mtmp))
                     trapkilled = TRUE;
-            } else {
-                deltrap(trap);
-                newsym(mtmp->mx, mtmp->my);
             }
             return trapkilled ? Trap_Killed_Mon : mtmp->mtrapped
                 ? Trap_Caught_Mon : Trap_Effect_Finished;