diff --git a/sky/skylet/providers/command_runner.py b/sky/skylet/providers/command_runner.py
index 02eea737727..e12305882b9 100644
--- a/sky/skylet/providers/command_runner.py
+++ b/sky/skylet/providers/command_runner.py
@@ -143,7 +143,9 @@ def run_init(self, *, as_head: bool, file_mounts: Dict[str, str],
                 docker_login_config.password,
                 docker_login_config.server,
             ))
-            specific_image = f'{docker_login_config.server}/{specific_image}'
+            server_prefix = f'{docker_login_config.server}/'
+            if not specific_image.startswith(server_prefix):
+                specific_image = f'{server_prefix}{specific_image}'
 
         if self.docker_config.get('pull_before_run', True):
             assert specific_image, ('Image must be included in config if ' +