diff --git a/src/net/torvald/terrarum/worlddrawer/LightmapRendererNew.kt b/src/net/torvald/terrarum/worlddrawer/LightmapRendererNew.kt
index 1bb865dd4..08fafc547 100644
--- a/src/net/torvald/terrarum/worlddrawer/LightmapRendererNew.kt
+++ b/src/net/torvald/terrarum/worlddrawer/LightmapRendererNew.kt
@@ -362,7 +362,7 @@ object LightmapRenderer {
                                     val ux = m.x + for_x_start - overscan_open
                                     val uy = m.y + for_y_start - overscan_open
 
-                                    (oldCol ?: colourNull) maxBlend calculate(ux, uy)
+                                    (oldCol ?: colourNull).cpy().maxAndAssign(calculate(ux, uy))
                                 }
                             }
                         }
@@ -772,20 +772,6 @@ object LightmapRenderer {
         )
     }
 
-    /** Get each channel from two RGB values, return new RGB that has max value of each channel
-     * @param rgb
-     * @param rgb2
-     * @return
-     */
-    infix fun Color.maxBlend(other: Color): Color {
-        return Color(
-                if (this.r > other.r) this.r else other.r,
-                if (this.g > other.g) this.g else other.g,
-                if (this.b > other.b) this.b else other.b,
-                if (this.a > other.a) this.a else other.a
-        )
-    }
-
     /** infix is removed to clarify the association direction */
     fun Color.maxAndAssign(other: Color): Color {
         this.set(