diff --git a/sys/netpfil/pf/if_pfsync.c b/sys/netpfil/pf/if_pfsync.c
index 5923675ff14453..f161e63fc123b1 100644
--- a/sys/netpfil/pf/if_pfsync.c
+++ b/sys/netpfil/pf/if_pfsync.c
@@ -3199,6 +3199,9 @@ vnet_pfsync_uninit(const void *unused __unused)
 	ret = swi_remove(V_pfsync_swi_cookie);
 	MPASS(ret == 0);
 	ret = intr_event_destroy(V_pfsync_swi_ie);
+	if (ret != 0)
+		printf("ERROR: %s(): intr_event_destroy() ret = %d!\n",
+		    __func__, ret);
 	MPASS(ret == 0);
 }
 
diff --git a/sys/netpfil/pf/pf_ioctl.c b/sys/netpfil/pf/pf_ioctl.c
index 0fdf41a9811f11..93160bfda50694 100644
--- a/sys/netpfil/pf/pf_ioctl.c
+++ b/sys/netpfil/pf/pf_ioctl.c
@@ -6743,6 +6743,9 @@ pf_unload_vnet(void)
 	ret = swi_remove(V_pf_swi_cookie);
 	MPASS(ret == 0);
 	ret = intr_event_destroy(V_pf_swi_ie);
+	if (ret != 0)
+		printf("ERROR: %s(): intr_event_destroy() ret = %d!\n",
+		    __func__, ret);
 	MPASS(ret == 0);
 
 	pf_unload_vnet_purge();
diff --git a/sys/netpfil/pf/pflow.c b/sys/netpfil/pf/pflow.c
index 397d720215b212..82d2ccd213f3bf 100644
--- a/sys/netpfil/pf/pflow.c
+++ b/sys/netpfil/pf/pflow.c
@@ -466,6 +466,9 @@ pflow_destroy(int unit, bool drain)
 	error = swi_remove(sc->sc_swi_cookie);
 	MPASS(error == 0);
 	error = intr_event_destroy(sc->sc_swi_ie);
+	if (error != 0)
+		printf("ERROR: %s(): intr_event_destroy() error = %d!\n",
+		    __func__, error);
 	MPASS(error == 0);
 
 	callout_drain(&sc->sc_tmo);
diff --git a/sys/sys/interrupt.h b/sys/sys/interrupt.h
index 899d65e386e0ab..13e6bab8e8e330 100644
--- a/sys/sys/interrupt.h
+++ b/sys/sys/interrupt.h
@@ -181,7 +181,7 @@ int	intr_event_create(struct intr_event **event, void *source,
 	    __printflike(9, 10);
 int	intr_event_describe_handler(struct intr_event *ie, void *cookie,
 	    const char *descr);
-int	intr_event_destroy(struct intr_event *ie);
+int	__result_use_check intr_event_destroy(struct intr_event *ie);
 int	intr_event_handle(struct intr_event *ie, struct trapframe *frame);
 int	intr_event_remove_handler(void *cookie);
 int	intr_event_suspend_handler(void *cookie);
diff --git a/sys/x86/x86/intr_machdep.c b/sys/x86/x86/intr_machdep.c
index 023c3df22580de..663692509de411 100644
--- a/sys/x86/x86/intr_machdep.c
+++ b/sys/x86/x86/intr_machdep.c
@@ -234,8 +234,11 @@ intr_register_source(struct intsrc *isrc)
 		return (error);
 	sx_xlock(&intrsrc_lock);
 	if (interrupt_sources[vector] != NULL) {
+		int rc;
 		sx_xunlock(&intrsrc_lock);
-		intr_event_destroy(isrc->is_event);
+		rc = intr_event_destroy(isrc->is_event);
+			printf("ERROR: %s(): intr_event_destroy() rc = %d!\n",
+			    __func__, rc);
 		return (EEXIST);
 	}
 	intrcnt_register(isrc);