diff --git a/bin/to_ezfio.py b/bin/to_ezfio.py
index ff7604b..8aec6a4 100755
--- a/bin/to_ezfio.py
+++ b/bin/to_ezfio.py
@@ -171,5 +171,10 @@ def write_ezfioFile(res,filename):
   for i in "density density_lapl elf elf_grad eplf_lapl density_grad elf_grad elf_lapl eplf_grad".split():
     exec "ezfio.compute_%s = False" % i
 
-write_ezfioFile(file,firstArg+".ezfio")
+
+def main():
+  write_ezfioFile(file,firstArg+".ezfio")
+
+if __name__ == '__main__':
+  main()