diff --git a/tiled/_tests/test_slicer.py b/tiled/_tests/test_slicer.py
index fa79f7dbd..57c7bef7f 100644
--- a/tiled/_tests/test_slicer.py
+++ b/tiled/_tests/test_slicer.py
@@ -6,7 +6,8 @@
 slice_test_data = [
     "",
     ":",
-    "::" "0",
+    "::",
+    "0",
     "0:",
     "0::",
     ":0",