diff --git a/skyvern/forge/sdk/workflow/models/block.py b/skyvern/forge/sdk/workflow/models/block.py
index 4563e8007..33cfbc8db 100644
--- a/skyvern/forge/sdk/workflow/models/block.py
+++ b/skyvern/forge/sdk/workflow/models/block.py
@@ -578,9 +578,9 @@ def get_failure_reason(self) -> str | None:
 class ForLoopBlock(Block):
     block_type: Literal[BlockType.FOR_LOOP] = BlockType.FOR_LOOP
 
-    loop_over: PARAMETER_TYPE | None
-    loop_variable_reference: str | None
     loop_blocks: list[BlockTypeVar]
+    loop_over: PARAMETER_TYPE | None = None
+    loop_variable_reference: str | None = None
 
     def get_all_parameters(
         self,