diff --git a/aetherpy/io/read_routines.py b/aetherpy/io/read_routines.py
index e4c955e..1c14c18 100644
--- a/aetherpy/io/read_routines.py
+++ b/aetherpy/io/read_routines.py
@@ -407,7 +407,7 @@ def read_gitm_headers(filelist, finds=-1):
             _, rec_len = unpack(end_char + '2l', fin.read(8))
 
             # Test the version number
-            if 'version' not in header.keys() == 0:
+            if 'version' not in header.keys():
                 header["version"] = file_version
             elif header['version'] != file_version:
                 raise IOError(''.join(['unexpected version number in file ',