diff --git a/src/cocoa/dialog.mm b/src/cocoa/dialog.mm
index 0b4e1a8406..b82f6f2965 100644
--- a/src/cocoa/dialog.mm
+++ b/src/cocoa/dialog.mm
@@ -84,7 +84,7 @@ wxDialog::~wxDialog()
     wxLogDebug("Destroying");
     // setReleasedWhenClosed: NO
     [m_cocoaNSWindow close];
-    DisassociateNSPanel(m_cocoaNSWindow);
+    DisassociateNSPanel(GetNSPanel());
 }
 
 void wxDialog::Cocoa_close(void)