diff --git a/lib/libc/newlib/libc-hooks.c b/lib/libc/newlib/libc-hooks.c
index cdfd237ab82..92c49c122e9 100644
--- a/lib/libc/newlib/libc-hooks.c
+++ b/lib/libc/newlib/libc-hooks.c
@@ -305,6 +305,10 @@ void *_sbrk(intptr_t count)
 __weak FUNC_ALIAS(_sbrk, sbrk, void *);
 
 #ifdef CONFIG_MULTITHREADING
+
+/* Make sure _RETARGETABLE_LOCKING is enabled in toolchain */
+BUILD_ASSERT(IS_ENABLED(_RETARGETABLE_LOCKING), "Retargetable locking must be enabled");
+
 /*
  * Newlib Retargetable Locking Interface Implementation
  *