diff --git a/src/renderer.rs b/src/renderer.rs
index 65523672..911a9f39 100644
--- a/src/renderer.rs
+++ b/src/renderer.rs
@@ -368,6 +368,7 @@ impl Renderer<'_> {
             return;
         };
         let color = self.state.theme.colors.highlight.get();
+        self.base.ops.push(GfxApiOpt::Sync);
         self.base.fill_scaled_boxes(slice::from_ref(bounds), &color);
     }