diff --git a/synchros2/synchros2/launch/actions.py b/synchros2/synchros2/launch/actions.py
index 7b49861..b794527 100644
--- a/synchros2/synchros2/launch/actions.py
+++ b/synchros2/synchros2/launch/actions.py
@@ -60,23 +60,23 @@ def __init__(self, enum_type: Type[Enum], *args: Any, optional: bool = False, **
             raise KeyError("Cannot set `choices` for `DeclareEnumLaunchArgument`")
         if "default_value" in kwargs:
             default_value = kwargs["default_value"]
-            if isinstance(default_value, str):
-                if default_value not in choices:
+            if isinstance(default_value, enum_type):
+                if default_value not in enum_type:
                     raise ValueError(
                         (
                             f"For an Enum Launch Argument of type {enum_type.__name__}, the `default_value` must be"
                             f" from {choices} or {list(enum_type)}"
                         ),
                     )
-            elif isinstance(default_value, enum_type):
-                if default_value not in enum_type:
+                kwargs["default_value"] = str(default_value.value)
+            elif isinstance(default_value, str):
+                if default_value not in choices:
                     raise ValueError(
                         (
                             f"For an Enum Launch Argument of type {enum_type.__name__}, the `default_value` must be"
                             f" from {choices} or {list(enum_type)}"
                         ),
                     )
-                kwargs["default_value"] = str(default_value.value)
             else:
                 raise TypeError(
                     (