diff --git a/tools/ci/travis-install.py b/tools/ci/travis-install.py
index d3a3ce519..a28fa0339 100644
--- a/tools/ci/travis-install.py
+++ b/tools/ci/travis-install.py
@@ -70,7 +70,7 @@ def main():
     event_based = (os.environ.get('EVENT_BASED') == 'y')
 
     # Build and install
-    install(omp, mpi, phdf5, dagmc, event-based)
+    install(omp, mpi, phdf5, dagmc, event_based)
 
 if __name__ == '__main__':
     main()