diff --git a/podman_compose.py b/podman_compose.py
index c510d55..dc6aa4e 100755
--- a/podman_compose.py
+++ b/podman_compose.py
@@ -1375,11 +1375,7 @@ def resolve_extends(services, service_names, environ):
                 content = content["services"]
             subdirectory = os.path.dirname(filename)
             content = rec_subs(content, environ)
-            from_service = (
-                {}
-                if content.get(from_service_name, {}) is None
-                else content.get(from_service_name, {})
-            )
+            from_service = content.get(from_service_name, {}) or {}
             normalize_service(from_service, subdirectory)
         else:
             from_service = services.get(from_service_name, {}).copy()