diff --git a/tools/patman/series.py b/tools/patman/series.py
index a17a7d1de7b1a69bd5257cbbc004a84b149c0ca5..3399f2c8ddc34b7e81b7a050c0fda83538c74c14 100644
--- a/tools/patman/series.py
+++ b/tools/patman/series.py
@@ -12,7 +12,7 @@ import terminal
 
 # Series-xxx tags that we understand
 valid_series = ['to', 'cc', 'version', 'changes', 'prefix', 'notes', 'name',
-                'cover-cc', 'process_log']
+                'cover_cc', 'process_log']
 
 class Series(dict):
     """Holds information about a patch series, including all tags.