diff --git a/Snakefile b/Snakefile
index 8e138228..1c161bb6 100644
--- a/Snakefile
+++ b/Snakefile
@@ -18,7 +18,7 @@ ATLITE_NPROCESSES = config['atlite'].get('nprocesses', 4)
 
 
 wildcard_constraints:
-    weather_year="[0-9]{4}|$",
+    weather_year="[0-9]{4}|",
     simpl="[a-zA-Z0-9]*|all",
     clusters="[0-9]+m?|all",
     ll="(v|c)([0-9\.]+|opt|all)|all",