diff --git a/PDP11/pdp11_cpu.c b/PDP11/pdp11_cpu.c
index c5cf5d2c..54669379 100644
--- a/PDP11/pdp11_cpu.c
+++ b/PDP11/pdp11_cpu.c
@@ -2436,6 +2436,7 @@ while (reason == 0)  {
         else setTRAP (TRAP_ILL);
         break;                                          /* end case 017 */
         }                                               /* end switch op */
+    if (trap_req == 0)
     break;
     }                                                   /* end main loop */