diff --git a/.travis.yml b/.travis.yml
index 3261464ec09..a85b170aab1 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -44,6 +44,7 @@ script:
   - export CFLAGS='-std=c99  -fsanitize=address -fno-omit-frame-pointer'
   - ./configure
   - make -j distcheck
+  - export CFLAGS='-std=c99'
   - rm -rf build
   - mkdir build
   - cd build