diff --git a/src/mol-geo/geometry/overpaint-data.ts b/src/mol-geo/geometry/overpaint-data.ts
index c256cc8dc9feae640093a59f1945af66c79634aa..b97e19a4abfcc6f8f09cb8c9df01cf58b8082781 100644
--- a/src/mol-geo/geometry/overpaint-data.ts
+++ b/src/mol-geo/geometry/overpaint-data.ts
@@ -24,7 +24,7 @@ export function applyOverpaintColor(array: Uint8Array, start: number, end: numbe
 }
 
 export function clearOverpaint(array: Uint8Array, start: number, end: number) {
-    array.fill(0, start, end)
+    array.fill(0, start * 4, end * 4)
 }
 
 export function createOverpaint(count: number, overpaintData?: OverpaintData): OverpaintData {