diff --git a/t/null_model_build.sh b/t/null_model_build.sh
index bf68203e..45689846 100755
--- a/t/null_model_build.sh
+++ b/t/null_model_build.sh
@@ -99,7 +99,7 @@ EOF
 mkdir -p $bld_dir/fms
 list_paths -o $bld_dir/fms/pathnames_fms $src_dir/FMS
 cd $bld_dir/fms
-mkmf -m Makefile -a $src_dir -b $bld_dir -p libfms.a -t $mkmf_template -g -c "-Duse_netCDF -Duse_libMPI -DMAXFIELDS_=200 -DMAXFIELDMETHODS_=200 -DINTERNAL_FILE_NML -DHAVE_GETTID" -IFMS/include -IFMS/mpp/include $bld_dir/fms/pathnames_fms
+mkmf -m Makefile -a $src_dir -b $bld_dir -p libfms.a -t $mkmf_template -g -o "-fallow-argument-mismatch" -c "-Duse_netCDF -Duse_libMPI -DMAXFIELDS_=200 -DMAXFIELDMETHODS_=200 -DINTERNAL_FILE_NML -DHAVE_GETTID" -IFMS/include -IFMS/mpp/include $bld_dir/fms/pathnames_fms
 cd $bld_dir
 
 # libocean_null