diff --git a/cgnslib.spec b/cgnslib.spec
index 31707c4..d436bfd 100644
--- a/cgnslib.spec
+++ b/cgnslib.spec
@@ -60,6 +60,7 @@ chmod a-x src/cgnstools/utilities/cgns_to_vtk.c
 
 
 %build
+export FCFLAGS+=-fallow-argument-mismatch
 %cmake3 -DCMAKE_SKIP_RPATH=ON \
        -DCGNS_ENABLE_TESTS=ON \
        -DCGNS_ENABLE_FORTRAN=ON \