diff --git a/config/gfortran_macos.cfg b/config/gfortran_macos.cfg
index b7781a68..4fffca29 100644
--- a/config/gfortran_macos.cfg
+++ b/config/gfortran_macos.cfg
@@ -10,7 +10,7 @@
 #
 #
 [COMMON]
-FC           : gfortran -ffree-line-length-none -I . -g -fPIC
+FC           : gfortran -ffree-line-length-none -I . -g -fPIC -std=legacy
 LAPACK_LIB   : -llapack -lblas
 IRPF90       : irpf90
 IRPF90_FLAGS : --ninja --align=32 -DSET_NESTED -DMACOS