diff --git a/installsystems/tools.py b/installsystems/tools.py
index 88314ee5d1268c893637d5fda5a7b092a2b36bfd..9f4575d55c15b6a10fe14d9b1c0aad6595ef24b4 100644
--- a/installsystems/tools.py
+++ b/installsystems/tools.py
@@ -117,7 +117,7 @@ def abspath(path):
         return path
     elif ptype == "file":
         if path.startswith("file://"):
-            path = path[len("file://")]
+            path = path[len("file://"):]
         return os.path.abspath(path)
     else:
         return None