diff --git a/src/text_render.rs b/src/text_render.rs
index d1b4150..6f0cb47 100644
--- a/src/text_render.rs
+++ b/src/text_render.rs
@@ -73,10 +73,10 @@ impl TextRenderer {
             let bounds_max_y = text_area.bounds.bottom.min(resolution.height as i32);
 
             let is_run_visible = |run: &cosmic_text::LayoutRun| {
-                let start_y = (text_area.top + run.line_top) as i32;
-                let end_y = (text_area.top + run.line_top + run.line_height) as i32;
-
-                start_y <= text_area.bounds.bottom && text_area.bounds.top <= end_y
+                let start_y_physical = (text_area.top + (run.line_top * text_area.scale)) as i32;
+                let end_y_physical = start_y_physical + (run.line_height * text_area.scale) as i32;
+                
+                start_y_physical <= text_area.bounds.bottom && text_area.bounds.top <= end_y_physical
             };
 
             let layout_runs = text_area