diff --git a/src/hgvs/pretty/datacompiler.py b/src/hgvs/pretty/datacompiler.py
index a037bcce..1e1975a3 100644
--- a/src/hgvs/pretty/datacompiler.py
+++ b/src/hgvs/pretty/datacompiler.py
@@ -367,7 +367,7 @@ def data(
             var_c_or_n,
             var_p,
             position_details,
-            is_rna
+            is_rna=is_rna
         )
 
         return vd