diff --git a/pre_commit/languages/docker.py b/pre_commit/languages/docker.py
index 9f2e137f..e3970f49 100644
--- a/pre_commit/languages/docker.py
+++ b/pre_commit/languages/docker.py
@@ -78,22 +78,15 @@ def install_environment(
 
 
 def get_docker_user() -> Tuple[str, ...]:  # pragma: win32 no cover
-    try:
-        rootless = False
-        output = subprocess.check_output(('docker', 'system', 'info'), text=True)
-        for line in output.splitlines():
-            # rootless docker has "rootless"
-            # rootless podman has "rootless: true"
-            if line.strip().startswith('rootless'):
-                if not 'false' in line:
-                    rootless = True
-                break
-        if not rootless:
-            return ('-u', f'{os.getuid()}:{os.getgid()}')
-        else:
-            return()
-    except AttributeError:
-        return ()
+    output = subprocess.check_output(('docker', 'system', 'info'), text=True)
+    for line in output.splitlines():
+        # rootless docker has "rootless"
+        # rootless podman has "rootless: true"
+        if line.strip().startswith('rootless'):
+            if not 'false' in line:
+                return ()  # no -u for rootless
+            break
+    return ('-u', f'{os.getuid()}:{os.getgid()}')
 
 
 def docker_cmd() -> Tuple[str, ...]:  # pragma: win32 no cover