diff --git a/lib/util.c b/lib/util.c
index a2eae15..ef8c25b 100644
--- a/lib/util.c
+++ b/lib/util.c
@@ -1188,7 +1188,7 @@ EXPORTED int buf_getline(struct buf *buf, FILE *fp)
 
 #ifdef HAVE_DECLARE_OPTIMIZE
 EXPORTED inline size_t buf_len(const struct buf *buf)
-    __attribute__((always_inline, optimize("-O3")));
+    __attribute__((optimize("-O3")));
 #endif
 EXPORTED inline size_t buf_len(const struct buf *buf)
 {