diff --git a/src/osx/cocoa/dataview.mm b/src/osx/cocoa/dataview.mm
index a8daf00882..87ce901da5 100644
--- a/src/osx/cocoa/dataview.mm
+++ b/src/osx/cocoa/dataview.mm
@@ -2019,7 +2019,7 @@ void wxCocoaDataViewControl::InitOutlineView(long style)
     NSTableHeaderView* header = nil;
     if ( !(style & wxDV_NO_HEADER) )
     {
-        header = [[wxDVCNSHeaderView alloc] initWithDVC:GetDataViewCtrl()];
+        header = [[[wxDVCNSHeaderView alloc] initWithDVC:GetDataViewCtrl()] autorelease];
     }
 
     [m_OutlineView setHeaderView:header];
diff --git a/src/osx/cocoa/statbox.mm b/src/osx/cocoa/statbox.mm
index b49203df2b..7af80028cb 100644
--- a/src/osx/cocoa/statbox.mm
+++ b/src/osx/cocoa/statbox.mm
@@ -86,7 +86,7 @@ wxWidgetImplType* wxWidgetImpl::CreateGroupBox( wxWindowMac* wxpeer,
     NSRect r = wxOSXGetFrameForControl( wxpeer, pos , size ) ;
     wxNSBox* v = [[wxNSBox alloc] initWithFrame:r];
     NSSize margin = { 0.0, 0.0 };
-    [v setContentView:[[wxNSBoxContentView alloc] init]];
+    [v setContentView:[[[wxNSBoxContentView alloc] init] autorelease]];
     [v setContentViewMargins: margin];
     [v sizeToFit];
     wxStaticBoxCocoaImpl* c = new wxStaticBoxCocoaImpl( wxpeer, v );
diff --git a/src/osx/core/uilocale.mm b/src/osx/core/uilocale.mm
index 299abb505e..4d0dd87c92 100644
--- a/src/osx/core/uilocale.mm
+++ b/src/osx/core/uilocale.mm
@@ -303,7 +303,9 @@ wxUILocaleImplCF::GetMonthName(wxDateTime::Month month, wxDateTime::NameForm for
     }
 
     NSString* monthName = [monthNames objectAtIndex:(month)];
-    return wxCFStringRef::AsString(monthName);
+    wxCFStringRef cf(monthName);
+    [df release];
+    return cf.AsString();
 }
 
 wxString
@@ -348,7 +350,9 @@ wxUILocaleImplCF::GetWeekDayName(wxDateTime::WeekDay weekday, wxDateTime::NameFo
     }
 
     NSString* weekdayName = [weekdayNames objectAtIndex:(weekday)];
-    return wxCFStringRef::AsString(weekdayName);
+    wxCFStringRef cf(weekdayName);
+    [df release];
+    return cf.AsString();
 }
 #endif // wxUSE_DATETIME
 
diff --git a/src/osx/webview_webkit.mm b/src/osx/webview_webkit.mm
index 838c7a276e..31df5c1e30 100644
--- a/src/osx/webview_webkit.mm
+++ b/src/osx/webview_webkit.mm
@@ -263,7 +263,7 @@ bool wxWebViewWebKit::Create(wxWindow *parent,
         {
             for (const auto& kv : m_handlers)
             {
-                [webViewConfig setURLSchemeHandler:[[WebViewCustomProtocol alloc] initWithHandler:kv.second.get()]
+                [webViewConfig setURLSchemeHandler:[[[WebViewCustomProtocol alloc] initWithHandler:kv.second.get()] autorelease]
                                             forURLScheme:wxCFStringRef(kv.first).AsNSString()];
             }
         }
@@ -334,7 +334,7 @@ bool wxWebViewWebKit::Create(wxWindow *parent,
             document.webkitFullscreenEnabled = true; \
         ");
         [m_webView.configuration.userContentController addScriptMessageHandler:
-            [[WebViewScriptMessageHandler alloc] initWithWxWindow:this] name:@"__wxfullscreen"];
+            [[[WebViewScriptMessageHandler alloc] initWithWxWindow:this]autorelease] name:@"__wxfullscreen"];
     }
 
     m_UIDelegate = uiDelegate;
@@ -620,7 +620,7 @@ void wxWebViewWebKit::RunScriptAsync(const wxString& javascript, void* clientDat
 bool wxWebViewWebKit::AddScriptMessageHandler(const wxString& name)
 {
     [m_webView.configuration.userContentController addScriptMessageHandler:
-        [[WebViewScriptMessageHandler alloc] initWithWxWindow:this] name:wxCFStringRef(name).AsNSString()];
+        [[[WebViewScriptMessageHandler alloc] initWithWxWindow:this] autorelease] name:wxCFStringRef(name).AsNSString()];
     // Make webkit message handler available under common name
     wxString js = wxString::Format("window.%s = window.webkit.messageHandlers.%s;",
             name, name);
@@ -644,6 +644,7 @@ bool wxWebViewWebKit::AddUserScript(const wxString& javascript,
                 WKUserScriptInjectionTimeAtDocumentStart : WKUserScriptInjectionTimeAtDocumentEnd
             forMainFrameOnly:NO];
     [m_webView.configuration.userContentController addUserScript:userScript];
+    [userScript release];
     return true;
 }
 
diff --git a/src/stc/PlatWXcocoa.mm b/src/stc/PlatWXcocoa.mm
index 675fb99976..f3ca08b8ce 100644
--- a/src/stc/PlatWXcocoa.mm
+++ b/src/stc/PlatWXcocoa.mm
@@ -106,7 +106,7 @@ WX_NSWindow CreateFloatingWindow(wxWindow* wxWin)
                                                   defer: NO];
     [w setLevel:NSPopUpMenuWindowLevel];
     [w setHasShadow:YES];
-    [w setContentView:[[wxSTCPopupBaseView alloc] initWithwxWin:wxWin]];
+    [w setContentView:[[[wxSTCPopupBaseView alloc] initWithwxWin:wxWin] autorelease]] ;
 
     return w;
 }