diff --git a/lib/websearch_webinterface.py b/lib/websearch_webinterface.py
index <HASH>..<HASH> 100644
--- a/lib/websearch_webinterface.py
+++ b/lib/websearch_webinterface.py
@@ -36,7 +36,7 @@ MAX_KEYWORD_LIST = 10
 MAX_VENUE_LIST = 10
 #tag constants
 AUTHOR_TAG = "100__a"
-COAUTHOR_TAG = "700_a"
+COAUTHOR_TAG = "700__a"
 AUTHOR_INST_TAG = "100__u"
 VENUE_TAG = "909C4p"
 KEYWORD_TAG = "6531_a"
Fixed wrong definition of COAUTHOR_TAG.