diff --git a/port/moonlight/src/trap_non_vectored.c b/port/moonlight/src/trap_non_vectored.c
index 0f891d7..90c5d21 100644
--- a/port/moonlight/src/trap_non_vectored.c
+++ b/port/moonlight/src/trap_non_vectored.c
@@ -18,6 +18,9 @@
 
 extern void _tx_timer_interrupt(void);
 extern uintptr_t exception(uintptr_t mcause, uintptr_t mepc, uintptr_t mtval);
+#ifdef TX_REGRESSION_TEST
+extern void test_interrupt_dispatch(void);
+#endif
 
 void (*irq_handler[__riscv_xlen])();
 
@@ -38,6 +41,9 @@ void trap_handler(uintptr_t mcause, uintptr_t mepc, uintptr_t mtval) {
                 printf("Timer interrupt being handled (pc=%lx)\n", mepc);
 #endif
                 hwtimer_handler();
+#ifdef TX_REGRESSION_TEST
+                test_interrupt_dispatch();
+#endif
                 _tx_timer_interrupt();
                 break;
 #ifdef TX_THREAD_SMP_INTER_CORE_INTERRUPT