diff --git a/kernel/include/kernel_internal.h b/kernel/include/kernel_internal.h
index d113b06..6fc14e5 100644
--- a/kernel/include/kernel_internal.h
+++ b/kernel/include/kernel_internal.h
@@ -124,6 +124,10 @@
 extern uint8_t *z_priv_stack_find(k_thread_stack_t *stack);
 #endif
 
+#ifdef CONFIG_USERSPACE
+bool z_stack_is_user_capable(k_thread_stack_t *stack);
+#endif /* CONFIG_USERSPACE */
+
 #ifdef __cplusplus
 }
 #endif