diff --git a/packages/display/src/displays/webgl/buffer/FeatureFactory.ts b/packages/display/src/displays/webgl/buffer/FeatureFactory.ts
index dc7a62ed3..aebb4225a 100644
--- a/packages/display/src/displays/webgl/buffer/FeatureFactory.ts
+++ b/packages/display/src/displays/webgl/buffer/FeatureFactory.ts
@@ -169,7 +169,9 @@ export class FeatureFactory {
     }
 
     private toRGBA(color: Color, alpha: number = 1, premultiplyAlpha: boolean = true): RGBA {
-        const rgba = toRGB(color);
+        const rgba = Array.isArray(color)
+            ? [color[0], color[1], color[2], color[3]??1] as RGBA
+            : toRGB(color);
         if (rgba) {
             alpha = rgba[3] *= alpha;
             if (premultiplyAlpha) {