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-rw-r--r--lib/stwcs/wcsutil/wcscorr.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/stwcs/wcsutil/wcscorr.py b/lib/stwcs/wcsutil/wcscorr.py
index 16ad09b..ac2484b 100644
--- a/lib/stwcs/wcsutil/wcscorr.py
+++ b/lib/stwcs/wcsutil/wcscorr.py
@@ -329,7 +329,7 @@ def update_wcscorr(dest, source=None, extname='SCI', wcs_id=None, active=True):
prihdr = source[0].header
# Get headerlet related keywords here
- sipname, idctab = utils.build_sipname(source, fname, None)
+ sipname, idctab = utils.build_sipname(source, fname, "None")
npolname, npolfile = utils.build_npolname(source, None)
d2imname, d2imfile = utils.build_d2imname(source, None)
if 'hdrname' in prihdr: