diff --git a/doc/python_api/rst_from_bmesh_opdefines.py b/doc/python_api/rst_from_bmesh_opdefines.py
index 3b10d5da46d..3b776257c15 100644
--- a/doc/python_api/rst_from_bmesh_opdefines.py
+++ b/doc/python_api/rst_from_bmesh_opdefines.py
@@ -157,6 +157,8 @@ def main():
             l = l.strip()
             # casts
             l = l.replace("(int)", "")
+            l = re.sub(r'to_subtype_union\((.*?)\)', '{\\1}', l)
+            l = re.sub(r'eBMOpSlotSubType_Elem\((.*?)\)', '\\1', l)
 
             l = l.replace("{", "(")
             l = l.replace("}", ")")