diff --git a/shell/browser/native_window_mac.mm b/shell/browser/native_window_mac.mm
index 9e87c14ea4ba..a13d5488e2ba 100644
--- a/shell/browser/native_window_mac.mm
+++ b/shell/browser/native_window_mac.mm
@@ -916,7 +916,8 @@ bool NativeWindowMac::IsMaximizable() const {
 
 void NativeWindowMac::UpdateZoomButton() {
   [[window_ standardWindowButton:NSWindowZoomButton]
-      setEnabled:IsResizable() && (CanMaximize() || IsFullScreenable())];
+      setEnabled:HasStyleMask(NSWindowStyleMaskResizable) &&
+                 (CanMaximize() || IsFullScreenable())];
 }
 
 void NativeWindowMac::SetFullScreenable(bool fullscreenable) {