diff --git a/src/win/fs.c b/src/win/fs.c
index 60e67a41..52290a9f 100644
--- a/src/win/fs.c
+++ b/src/win/fs.c
@@ -1048,6 +1048,8 @@ static void fs__sendfile(uv_fs_t* req) {
     }
   }
 
+  free(buf);
+
   SET_REQ_RESULT(req, result);
 }