diff --git a/legacy/eina/src/lib/eina_strbuf.c b/legacy/eina/src/lib/eina_strbuf.c
index 1125b9b568..ff6d343b06 100644
--- a/legacy/eina/src/lib/eina_strbuf.c
+++ b/legacy/eina/src/lib/eina_strbuf.c
@@ -42,8 +42,8 @@ struct _Eina_Strbuf
 
 static void _eina_strbuf_init(Eina_Strbuf *buf);
 static Eina_Bool _eina_strbuf_resize(Eina_Strbuf *buf, size_t size);
-#define _eina_strbuf_grow(buf, _size) \
-   (_size > buf->size) ? _eina_strbuf_resize(buf, _size) : EINA_TRUE
+#define _eina_strbuf_grow(_buf, _size) \
+   ((_size) > (_buf)->size) ? _eina_strbuf_resize((_buf), (_size)) : EINA_TRUE
 
 Eina_Bool
 eina_strbuf_init(void)