diff --git a/src/cocoa/dialog.mm b/src/cocoa/dialog.mm
index 59cf2fb0a2..3a3625556d 100644
--- a/src/cocoa/dialog.mm
+++ b/src/cocoa/dialog.mm
@@ -76,7 +76,7 @@ wxDialog::~wxDialog()
     wxLogDebug("Destroying");
     // setReleasedWhenClosed: NO
     [m_cocoaNSWindow close];
-    SetNSPanel(NULL);
+    DisassociateNSPanel(m_cocoaNSWindow);
 }
 
 void wxDialog::Cocoa_close(void)