diff --git a/src/libs/compat/freebsd_wlan/net80211/ieee80211_haiku.cpp b/src/libs/compat/freebsd_wlan/net80211/ieee80211_haiku.cpp
index 1ffcdb24c8..9bc487afd4 100644
--- a/src/libs/compat/freebsd_wlan/net80211/ieee80211_haiku.cpp
+++ b/src/libs/compat/freebsd_wlan/net80211/ieee80211_haiku.cpp
@@ -147,7 +147,7 @@ start_wlan(device_t device)
 
 	// ic_vap_create() established that gDevices[i] links to vap->iv_ifp now
 	KASSERT(gDevices[i] == vap->iv_ifp,
-		"start_wlan: gDevices[i] != vap->iv_ifp");
+		("start_wlan: gDevices[i] != vap->iv_ifp"));
 
 	vap->iv_ifp->scan_done_sem = create_sem(0, "wlan scan done");
 
@@ -182,7 +182,7 @@ stop_wlan(device_t device)
 	ic->ic_vap_delete(vap);
 
 	// ic_vap_delete freed gDevices[i]
-	KASSERT(gDevices[i] == NULL, "stop_wlan: gDevices[i] != NULL");
+	KASSERT(gDevices[i] == NULL, ("stop_wlan: gDevices[i] != NULL"));
 
 	// assign the base device ifp again
 	gDevices[i] = ic->ic_ifp;
diff --git a/src/libs/compat/freebsd_wlan/net80211/ieee80211_haiku.h b/src/libs/compat/freebsd_wlan/net80211/ieee80211_haiku.h
index ce6846afc6..c2735078f1 100644
--- a/src/libs/compat/freebsd_wlan/net80211/ieee80211_haiku.h
+++ b/src/libs/compat/freebsd_wlan/net80211/ieee80211_haiku.h
@@ -40,6 +40,7 @@
 extern "C" {
 #	endif
 
+#define INVARIANTS 1
 
 #include <sys/kernel.h>
 #include <sys/mutex.h>