diff --git a/src/Avalonia.Themes.Fluent/Controls/WindowDrawnDecorations.xaml b/src/Avalonia.Themes.Fluent/Controls/WindowDrawnDecorations.xaml
index d00007010c..b2d66fdbbd 100644
--- a/src/Avalonia.Themes.Fluent/Controls/WindowDrawnDecorations.xaml
+++ b/src/Avalonia.Themes.Fluent/Controls/WindowDrawnDecorations.xaml
@@ -190,12 +190,7 @@
     <Style Selector="^:maximized /template/ Path#RestoreButtonPath">
       <Setter Property="Data" Value="M2048 410h-410v-410h-1638v1638h410v410h1638v-1638zM1434 1434h-1229v-1229h1229v1229zM1843 1843h-1229v-205h1024v-1024h205v1229z" />
     </Style>
-
-    <!-- Fullscreen: update fullscreen button icon to "exit fullscreen" -->
-    <Style Selector="^:fullscreen /template/ Path#FullScreenButtonPath">
-      <Setter Property="Data" Value="M205 1024h819v-819h-205v469l-674 -674l-145 145l674 674h-469v205zM1374 1229h469v-205h-819v819h205v-469l674 674l145 -145z" />
-    </Style>
-
+    
     <!-- Disabled buttons -->
     <Style Selector="^ /template/ Button:disabled">
       <Setter Property="Opacity" Value="0.2"/>
diff --git a/src/Avalonia.Themes.Simple/Controls/WindowDrawnDecorations.xaml b/src/Avalonia.Themes.Simple/Controls/WindowDrawnDecorations.xaml
index a7ae9a7f2e..d4e938b58c 100644
--- a/src/Avalonia.Themes.Simple/Controls/WindowDrawnDecorations.xaml
+++ b/src/Avalonia.Themes.Simple/Controls/WindowDrawnDecorations.xaml
@@ -197,11 +197,6 @@
       <Setter Property="Data" Value="M2048 410h-410v-410h-1638v1638h410v410h1638v-1638zM1434 1434h-1229v-1229h1229v1229zM1843 1843h-1229v-205h1024v-1024h205v1229z" />
     </Style>
 
-    <!-- Fullscreen: update fullscreen button icon to "exit fullscreen" -->
-    <Style Selector="^:fullscreen /template/ Path#FullScreenButtonPath">
-      <Setter Property="Data" Value="M205 1024h819v-819h-205v469l-674 -674l-145 145l674 674h-469v205zM1374 1229h469v-205h-819v819h205v-469l674 674l145 -145z" />
-    </Style>
-
     <!-- Disabled buttons -->
     <Style Selector="^ /template/ Button:disabled">
       <Setter Property="Opacity" Value="0.2"/>