diff --git a/tests/checkupdates.TestCase b/tests/checkupdates.TestCase
index c431cae4..c0a85c37 100755
--- a/tests/checkupdates.TestCase
+++ b/tests/checkupdates.TestCase
@@ -14,7 +14,7 @@ from pathlib import Path
 localmodule = Path(__file__).resolve().parent.parent
 print('localmodule: ' + str(localmodule))
 if localmodule not in sys.path:
-    sys.path.insert(0, localmodule)
+    sys.path.insert(0, str(localmodule))
 
 import fdroidserver.checkupdates
 import fdroidserver.metadata