diff --git a/HMCLCore/src/main/java/org/jackhuang/hmcl/util/gson/PaintAdapter.java b/HMCLCore/src/main/java/org/jackhuang/hmcl/util/gson/PaintAdapter.java
index e771a3d2f..3098f51e0 100644
--- a/HMCLCore/src/main/java/org/jackhuang/hmcl/util/gson/PaintAdapter.java
+++ b/HMCLCore/src/main/java/org/jackhuang/hmcl/util/gson/PaintAdapter.java
@@ -40,7 +40,10 @@ public final class PaintAdapter extends TypeAdapter<Paint> {
             int green = (int) Math.round(color.getGreen() * 255.);
             int blue = (int) Math.round(color.getBlue() * 255.);
             int opacity = (int) Math.round(color.getOpacity() * 255.);
-            out.value(String.format("#%02x%02x%02x%02x", red, green, blue, opacity));
+            if (opacity < 255)
+                out.value(String.format("#%02x%02x%02x%02x", red, green, blue, opacity));
+            else
+                out.value(String.format("#%02x%02x%02x", red, green, blue));
         } else if (value instanceof LinearGradient
                 || value instanceof RadialGradient) {
             out.value(value.toString());