diff --git a/setup.py b/setup.py
index 4367d8b..a02e416 100644
--- a/setup.py
+++ b/setup.py
@@ -192,6 +192,7 @@ def run(self):
     include_dirs=[f2py_cdf_include_path],
     f2py_options=['--quiet', '--include-paths', f2py_cdf_include_path],  # '--Wall', 'n', '--Wno-tabs', 'n'],
     extra_objects=[f2py_cdf_lib_path],
+    extra_f77_compile_args=['--std=legacy'],
     extra_link_args=extra_link_args)