diff --git a/src/main/java/com/loomcom/symon/ui/Ui.java b/src/main/java/com/loomcom/symon/ui/Ui.java
index ade8dd1..42dd71c 100644
--- a/src/main/java/com/loomcom/symon/ui/Ui.java
+++ b/src/main/java/com/loomcom/symon/ui/Ui.java
@@ -132,7 +132,9 @@ public final class Ui {
     }
 
     private static void applyDetectedUiScale() {
-        Double rawScale = X11ResourceReader.readXftDpiScale(); // ex: 1.5, 2.0, 2.5...
+        Double rawScale = null;
+
+        if (SystemInfo.isLinux) rawScale = X11ResourceReader.readXftDpiScale(); // ex: 1.5, 2.0, 2.5...
 
         if (rawScale != null && rawScale > 1.0) {
             // flatlaf.uiScale aceita frações — mantém a precisão original