diff --git a/src/font/shaper/web_canvas.zig b/src/font/shaper/web_canvas.zig
index dba9a18e7..278967617 100644
--- a/src/font/shaper/web_canvas.zig
+++ b/src/font/shaper/web_canvas.zig
@@ -287,7 +287,7 @@ pub const Wasm = struct {
         while (rowIter.next()) |row| {
             defer y += 1;
 
-            var iter = self.runIterator(group, row);
+            var iter = self.runIterator(group, row, null);
             while (try iter.next(alloc)) |run| {
                 const cells = try self.shape(run);
                 log.info("y={} run={d} shape={any} idx={}", .{