diff --git a/include/wx/taskbarbutton.h b/include/wx/taskbarbutton.h
index 98cc202d70..c6ea1ffd12 100644
--- a/include/wx/taskbarbutton.h
+++ b/include/wx/taskbarbutton.h
@@ -223,7 +223,7 @@ typedef wxVector<wxTaskBarJumpListCategory*> wxTaskBarJumpListCategories;
 class WXDLLIMPEXP_CORE wxTaskBarJumpList
 {
 public:
-    wxTaskBarJumpList(const wxString& appID = wxEmptyString);
+    explicit wxTaskBarJumpList(const wxString& appID = wxEmptyString);
     virtual ~wxTaskBarJumpList();
     void ShowRecentCategory(bool shown = true);
     void HideRecentCategory();
diff --git a/interface/wx/taskbarbutton.h b/interface/wx/taskbarbutton.h
index 899347ad2a..9de7e5959a 100644
--- a/interface/wx/taskbarbutton.h
+++ b/interface/wx/taskbarbutton.h
@@ -622,7 +622,7 @@ public:
             See <a href="http://msdn.microsoft.com/en-us/library/windows/desktop/dd378459(v=vs.85).aspx">
             Application User Model IDs</a> on MSDN for further details.
     */
-    wxTaskBarJumpList(const wxString& appID = wxEmptyString);
+    explicit wxTaskBarJumpList(const wxString& appID = wxEmptyString);
     virtual ~wxTaskBarJumpList();
 
     /**