diff --git a/src/sockopt.c b/src/sockopt.c
index 0e0cf77b2f5ea0ddf1c2e202e538a2f711d36baf..5397c0b17dd4f5211ff05a17bb7cae408d897635 100644
--- a/src/sockopt.c
+++ b/src/sockopt.c
@@ -1238,7 +1238,7 @@ int tcpsendfile_ex(int sock, const char *filename, const int64_t file_offset, \
                 break;
             }
         }
-        remain_bytes -= fsbytes;
+        remain_bytes -= sbytes;
     }
 #endif
 #endif