diff --git a/examples/nx/nx_internal.h b/examples/nx/nx_internal.h
index b01fa5db642..fa3120906e9 100644
--- a/examples/nx/nx_internal.h
+++ b/examples/nx/nx_internal.h
@@ -82,6 +82,9 @@
 #  ifndef CONFIG_EXAMPLES_NX_SERVERPRIO
 #    define CONFIG_EXAMPLES_NX_SERVERPRIO 100
 #  endif
+#  ifndef CONFIG_EXAMPLES_NX_NOTIFYSIGNO
+#    define CONFIG_EXAMPLES_NX_NOTIFYSIGNO 4
+#  endif
 #endif
 
 /* Debug ********************************************************************/