diff --git a/src/webui/abstractwebapplication.cpp b/src/webui/abstractwebapplication.cpp
index 8b07b89c7..79c23bc42 100644
--- a/src/webui/abstractwebapplication.cpp
+++ b/src/webui/abstractwebapplication.cpp
@@ -404,11 +404,18 @@ QString AbstractWebApplication::saveTmpFile(const QByteArray &data)
     return QString();
 }
 
-const QStringMap AbstractWebApplication::CONTENT_TYPE_BY_EXT = {
-    { "htm", Http::CONTENT_TYPE_HTML },
-    { "html", Http::CONTENT_TYPE_HTML },
-    { "css", Http::CONTENT_TYPE_CSS },
-    { "gif", Http::CONTENT_TYPE_GIF },
-    { "png", Http::CONTENT_TYPE_PNG },
-    { "js", Http::CONTENT_TYPE_JS }
-};
+QStringMap AbstractWebApplication::initializeContentTypeByExtMap()
+{
+    QStringMap map;
+
+    map["htm"] = Http::CONTENT_TYPE_HTML;
+    map["html"] = Http::CONTENT_TYPE_HTML;
+    map["css"] = Http::CONTENT_TYPE_CSS;
+    map["gif"] = Http::CONTENT_TYPE_GIF;
+    map["png"] = Http::CONTENT_TYPE_PNG;
+    map["js"] = Http::CONTENT_TYPE_JS;
+
+    return map;
+}
+
+const QStringMap AbstractWebApplication::CONTENT_TYPE_BY_EXT = AbstractWebApplication::initializeContentTypeByExtMap();
diff --git a/src/webui/abstractwebapplication.h b/src/webui/abstractwebapplication.h
index 8d1227fc9..e0e1ed279 100644
--- a/src/webui/abstractwebapplication.h
+++ b/src/webui/abstractwebapplication.h
@@ -103,6 +103,7 @@ private:
     static void translateDocument(QString &data);
 
     static const QStringMap CONTENT_TYPE_BY_EXT;
+    static QStringMap initializeContentTypeByExtMap();
 };
 
 #endif // ABSTRACTWEBAPPLICATION_H