diff --git a/src/murfey/workflows/fib/register_atlas.py b/src/murfey/workflows/fib/register_atlas.py
index 37fec21d6..f86bedff7 100644
--- a/src/murfey/workflows/fib/register_atlas.py
+++ b/src/murfey/workflows/fib/register_atlas.py
@@ -338,7 +338,6 @@ def _register_dcg_and_atlas(
 
 
 class FIBAtlasRegistrationInfo(BaseModel):
-    register: str
     session_id: int
     atlas_file: Path