diff --git a/src/modules/async/async_mod.c b/src/modules/async/async_mod.c
index d039ea0bd16..88affb3bbd3 100644
--- a/src/modules/async/async_mod.c
+++ b/src/modules/async/async_mod.c
@@ -28,6 +28,7 @@
 #include "../../core/sr_module.h"
 #include "../../core/dprint.h"
 #include "../../core/ut.h"
+#include "../../core/fmsg.h"
 #include "../../core/pvar.h"
 #include "../../core/timer_proc.h"
 #include "../../core/route_struct.h"
@@ -153,6 +154,11 @@ static int w_async_sleep(sip_msg_t *msg, char *sec, char *str2)
 	if(msg == NULL)
 		return -1;
 
+	if(faked_msg_match(msg)) {
+		LM_ERR("invalid usage for faked message\n");
+		return -1;
+	}
+
 	if(async_workers <= 0) {
 		LM_ERR("no async mod timer workers (modparam missing?)\n");
 		return -1;
@@ -210,6 +216,11 @@ int ki_async_route(sip_msg_t *msg, str *rn, int s)
 	int ri;
 	sr_kemi_eng_t *keng = NULL;
 
+	if(faked_msg_match(msg)) {
+		LM_ERR("invalid usage for faked message\n");
+		return -1;
+	}
+
 	keng = sr_kemi_eng_get();
 	if(keng == NULL) {
 		ri = route_lookup(&main_rt, rn->s);
@@ -285,6 +296,11 @@ int ki_async_task_route(sip_msg_t *msg, str *rn)
 	int ri;
 	sr_kemi_eng_t *keng = NULL;
 
+	if(faked_msg_match(msg)) {
+		LM_ERR("invalid usage for faked message\n");
+		return -1;
+	}
+
 	keng = sr_kemi_eng_get();
 	if(keng == NULL) {
 		ri = route_lookup(&main_rt, rn->s);