diff --git a/scripts/makedbh.in b/scripts/makedbh.in
index 21d6309a..98a8636d 100755
--- a/scripts/makedbh.in
+++ b/scripts/makedbh.in
@@ -51,6 +51,10 @@ add_generated_mask_macro(
     "TTMaskZero(m)",
     "(m)->tt_words[{i}] = 0",
 )
+add_generated_mask_macro(
+    "TTMaskCopy(m, n)",
+    "(m)->tt_words[{i}] = (n)->tt_words[{i}]",
+)
 add_generated_mask_macro(
     "TTMaskIsZero(m)",
     "(m)->tt_words[{i}] == 0",