diff --git a/arm_test_data/dataset.py b/arm_test_data/dataset.py
index bf9e819..30353fe 100644
--- a/arm_test_data/dataset.py
+++ b/arm_test_data/dataset.py
@@ -3,7 +3,7 @@
 
 DATASETS = pooch.create(
     path=pooch.os_cache('arm-test-data'),
-    base_url='https://github.com/ARM-DOE/arm-test-data/tree/main/data',
+    base_url='https://github.com/ARM-DOE/arm-test-data/tree/main/data/',
     env='ACT_TEST_DATA_DIR',
 )