diff --git a/ci/config.sh b/ci/config.sh
index 4bb88e3fcd97cee73f8fe6cf0db19912e187488a..5605ed2e1e0b4f2a9be0d1554af8140a9cdc3095 100644
--- a/ci/config.sh
+++ b/ci/config.sh
@@ -1,5 +1,5 @@
 #!/bin/bash
 mkdir build
 cd build
-export FC=mpif90 CC=mpicc CXX=mpic++
-cmake  -D CMAKE_BUILD_TYPE=Debug -DWITH_LIB_CXX=OFF  ..
+export FC=mpif90 CC=mpicc CXX=mpic++ F77=mpif90
+cmake  -DCMAKE_BUILD_TYPE=Debug -DWITH_LIB_CXX=OFF  ..