diff --git a/src/lib/lib.h b/src/lib/lib.h
index d933dc07adc..52d0166daa5 100644
--- a/src/lib/lib.h
+++ b/src/lib/lib.h
@@ -76,6 +76,9 @@ static inline void *i_memcpy(void *dest, const void *src, size_t n) {
 	return memcpy(dest, src, n);
 }
 #ifndef __cplusplus
+/* Silence warning warning: 'memcpy' macro redefined on macOS */
+#  undef memcpy
+
 #  define memcpy(dest, src, n) i_memcpy(dest, src, n)
 #endif