diff --git a/src/pdl/pdl_granite_io.py b/src/pdl/pdl_granite_io.py
index a0797edc6..6b31dbcbe 100644
--- a/src/pdl/pdl_granite_io.py
+++ b/src/pdl/pdl_granite_io.py
@@ -55,7 +55,7 @@ def processor_of_block(block: GraniteioModelBlock):
                 if processor.type is None:
                     processor_type = model
                 else:
-                    processor_type = value_of_expr(processor)
+                    processor_type = value_of_expr(processor.type)
 
                 assert isinstance(
                     processor_type, str