diff --git a/packages/display/src/displays/webgl/glsl/line_fragment.glsl b/packages/display/src/displays/webgl/glsl/line_fragment.glsl
index 7d088b6a7..b00433066 100644
--- a/packages/display/src/displays/webgl/glsl/line_fragment.glsl
+++ b/packages/display/src/displays/webgl/glsl/line_fragment.glsl
@@ -47,7 +47,7 @@ void main(void){
                 float u = patternPosition / dashPosition;
                 gl_FragColor = u_fill * texture2D(u_dashTexture, vec2(u, v_dir.y));
             #else
-                gl_FragColor = vec4(u_fill.rgb, step(patternPosition, dashPosition));
+                gl_FragColor = u_fill * step(patternPosition, dashPosition);
             #endif
         #endif