diff --git a/.travis.yml b/.travis.yml
index 5f6344be..e300d52c 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -73,7 +73,7 @@ matrix:
         -   tar -xf ta-lib-0.4.0-src.tar.gz
         -   cd ta-lib
         -   ./configure --prefix=/usr
-        -   make -j
+        -   make  # -j under gcc-7 failed!!?
         -   sudo make install
         - popd
         - python -m pip install numpy