diff --git a/src/docker_compose/cfg/compose_paths.py b/src/docker_compose/cfg/compose_paths.py
index a9f644e..49bb132 100644
--- a/src/docker_compose/cfg/compose_paths.py
+++ b/src/docker_compose/cfg/compose_paths.py
@@ -16,7 +16,7 @@ from docker_compose.util.yaml_util import path_to_typed, read_yaml
 @final
 @dataclass(frozen=True, slots=True)
 class ServiceVal(ReplaceStatic):
-    rep = ReplaceDynamic("service")
+    src = ReplaceDynamic("service")
 
 
 @final