diff --git a/src/add-ons/kernel/network/stack/interfaces.cpp b/src/add-ons/kernel/network/stack/interfaces.cpp
index ae004b896c..49139fcab7 100644
--- a/src/add-ons/kernel/network/stack/interfaces.cpp
+++ b/src/add-ons/kernel/network/stack/interfaces.cpp
@@ -480,6 +480,7 @@ Interface::Interface(const char* interfaceName,
 Interface::~Interface()
 {
 	TRACE("Interface %p: destructor\n", this);
+	ASSERT((flags & IFF_UP) == 0);
 
 	// Uninitialize the domain datalink protocols