diff --git a/src/corppa/utils/filter.py b/src/corppa/utils/filter.py
index e8208e5..751bfaf 100644
--- a/src/corppa/utils/filter.py
+++ b/src/corppa/utils/filter.py
@@ -125,7 +125,7 @@ def main():
 
     if not os.path.exists(args.idfile):
         print(f"Error: idfile {args.idfile} does not exist")
-        exit(-1)
+        sys.exit(-1)
     elif os.path.getsize(args.idfile) == 0:
         print(f"Error: idfile {args.idfile} is empty")
         exit(-1)