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-rw-r--r--lib/stwcs/wcsutil/altwcs.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/stwcs/wcsutil/altwcs.py b/lib/stwcs/wcsutil/altwcs.py
index 063df18..282461a 100644
--- a/lib/stwcs/wcsutil/altwcs.py
+++ b/lib/stwcs/wcsutil/altwcs.py
@@ -411,7 +411,7 @@ def next_wcskey(fobj, ext=None):
header: pyfits.Header
"""
_check_headerpars(fobj, ext)
- hdr = _getheader(fobj, hdr)
+ hdr = _getheader(fobj, ext)
allkeys = available_wcskeys(hdr)
if allkeys != []:
return allkeys[0]