diff --git a/sim_defs.h b/sim_defs.h
index faca87a5..488cd630 100644
--- a/sim_defs.h
+++ b/sim_defs.h
@@ -916,6 +916,7 @@ extern int32 sim_asynch_inst_latency;
                         sim_debug (SIM_DBG_EVENT, sim_dflt_dev, "Queue Corruption detected\n");\
                         fclose(sim_deb);                            \
                         }                                           \
+                    sim_printf("Queue Corruption detected\n");      \
                     abort();                                        \
                     }                                               \
             if (lock)                                               \
@@ -1358,7 +1359,7 @@ extern int32 sim_asynch_inst_latency;
       AIO_UNLOCK;                                                                \
       } else (void)0
 #endif /* USE_AIO_INTRINSICS */
-#define AIO_VALIDATE if (!pthread_equal ( pthread_self(), sim_asynch_main_threadid )) abort()
+#define AIO_VALIDATE if (!pthread_equal ( pthread_self(), sim_asynch_main_threadid )) {sim_printf("Improper thread context for operation\n"); abort();}
 #define AIO_CHECK_EVENT                                                \
     if (0 > --sim_asynch_check) {                                      \
       AIO_UPDATE_QUEUE;                                                \