diff --git a/include/spdk_internal/mock.h b/include/spdk_internal/mock.h
index 8de44ae555..18b1b93276 100644
--- a/include/spdk_internal/mock.h
+++ b/include/spdk_internal/mock.h
@@ -72,15 +72,19 @@
 	extern ret ut_ ## fn; \
 	ret __wrap_ ## fn args; ret __real_ ## fn args
 
-/* for defining the implmentation of wrappers for syscalls */
+/*
+ * For defining the implementation of wrappers for syscalls.
+ * Avoid nested macro calls to prevent macro expansion of fn.
+ */
 #define DEFINE_WRAPPER(fn, ret, dargs, pargs) \
-	DEFINE_RETURN_MOCK(fn, ret); \
+	bool ut_ ## fn ## _mocked = false; \
+	ret ut_ ## fn; \
 	__attribute__((used)) ret __wrap_ ## fn dargs \
 	{ \
 		if (!ut_ ## fn ## _mocked) { \
 			return __real_ ## fn pargs; \
 		} else { \
-			return MOCK_GET(fn); \
+			return ut_ ## fn; \
 		} \
 	}