diff --git a/src/core/batchrenamejob.cpp b/src/core/batchrenamejob.cpp
--- a/src/core/batchrenamejob.cpp
+++ b/src/core/batchrenamejob.cpp
@@ -25,7 +25,6 @@
 #include <QTimer>
 #include <QDebug>
 #include <QSet>
-#include <QMimeDatabase>
 
 using namespace KIO;
 
@@ -59,9 +58,16 @@
 
         // Check for extensions.
         QSet<QString> extensions;
-        QMimeDatabase db;
         foreach (const QUrl &url, m_srcList) {
-            const QString extension = db.suffixForFileName(url.toDisplayString().toLower());
+	    const QString urlStr=url.toDisplayString();
+	    QString extension;
+
+	    //If the oldFileName contains a '.' then its extension is all to the right of the last dot
+	    int dotIndex = urlStr.lastIndexOf(QStringLiteral("."));
+	    if (dotIndex != -1){
+	        extension = urlStr.mid(dotIndex+1);
+	    }
+
             if (extensions.contains(extension)) {
                 m_allExtensionsDifferent = false;
                 break;
@@ -168,8 +174,16 @@
     if (m_listIterator != m_srcList.constEnd()) {
         QString newName = indexedName(m_newName, m_index, m_placeHolder);
         const QUrl oldUrl = *m_listIterator;
-        QMimeDatabase db;
-        const QString extension = db.suffixForFileName(oldUrl.path().toLower());
+
+	const QString oldFileName = oldUrl.fileName();
+	QString extension;
+
+	//If the oldFileName contains a '.' then its extension is all to the right of the last dot
+        int dotIndex = oldFileName.lastIndexOf(QStringLiteral("."));
+        if (dotIndex != -1){
+            extension = oldFileName.mid(dotIndex+1);
+        }
+
         if (!extension.isEmpty()) {
             newName += QLatin1Char('.') + extension;
         }