diff --git a/.circleci/config.yml b/.circleci/config.yml
index 45ba0c7..ea257d4 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -47,10 +47,10 @@ jobs:
           command: |
             source ~/miniconda3/bin/activate wrf-python
             cd fortran/build_help
-            gfortran -o sizes -fopenmp omp_sizes.f90
+            $FC -o sizes -fopenmp omp_sizes.f90
             LD_LIBRARY_PATH=~/miniconda3/envs/wrf-python/lib python sub_sizes.py
             cd ..
-            gfortran -E ompgen.F90 -fopenmp -cpp -o omp.f90
+            $FC -E ompgen.F90 -fopenmp -cpp -o omp.f90
             cd ..
             python setup.py config_fc --f90flags="-mtune=generic -fopenmp" build_ext --libraries="gomp" build
             python setup.py install --single-version-externally-managed --record=record.txt