diff --git a/src/libnm-glib-aux/nm-test-utils.h b/src/libnm-glib-aux/nm-test-utils.h
index e884534727..6b4ed18916 100644
--- a/src/libnm-glib-aux/nm-test-utils.h
+++ b/src/libnm-glib-aux/nm-test-utils.h
@@ -85,6 +85,9 @@
 #undef g_assertion_message_expr
 #endif
 
+#undef NDEBUG
+#include <assert.h>
+
 #include <arpa/inet.h>
 #include <stdio.h>
 #include <unistd.h>