diff --git a/src/digraph.c b/src/digraph.c
index de4ff83..a1ae43a 100644
--- a/src/digraph.c
+++ b/src/digraph.c
@@ -2028,7 +2028,7 @@
 
     // clear screen, because some digraphs may be wrong, in which case we
     // messed up ScreenLines
-    must_redraw = UPD_CLEAR;
+    set_must_redraw(UPD_CLEAR);
 }
 
     static void