diff --git a/python/graminelibos/manifest_check.py b/python/graminelibos/manifest_check.py
index 2c865ccb73..32221d08d6 100644
--- a/python/graminelibos/manifest_check.py
+++ b/python/graminelibos/manifest_check.py
@@ -59,7 +59,7 @@
 
     Required('loader'): {
         # TODO: validator for sha256
-        Required('entrypoint'): {'uri': _uri, 'sha256': str},
+        Required('entrypoint'): {Required('uri'): _uri, 'sha256': str},
         'argv': [str],
         'argv_src_file': str,
         'env': {str: Any(str, {'value': str}, {'passthrough': True})},