diff --git a/konq-plugins/arkplugin/arkplugin.cpp b/konq-plugins/arkplugin/arkplugin.cpp
index 97513b8..f1687fc 100644
--- a/konq-plugins/arkplugin/arkplugin.cpp
+++ b/konq-plugins/arkplugin/arkplugin.cpp
@@ -375,6 +375,20 @@ void ArkMenu::extMimeTypes()
         m_extractMimeTypes << "application/x-lzop";
     }
 
+    bool havelzma = false;
+    if ( !KStandardDirs::findExe( "lzma" ).isNull() )
+    {
+        havelzma = true;
+        m_archiveMimeTypes << "application/x-lzma";
+    }
+
+    bool havexz = false;
+    if ( !KStandardDirs::findExe( "xz" ).isNull() )
+    {
+        havexz = true;
+        m_archiveMimeTypes << "application/x-xz";
+    }
+
     if ( !KStandardDirs::findExe( "tar" ).isNull() )
     {
         m_extractMimeTypes << "application/x-tar";
@@ -387,6 +401,10 @@ void ArkMenu::extMimeTypes()
         }
         if ( havelzop )
             m_extractMimeTypes << "application/x-tzo";
+        if ( havelzma )
+            m_extractMimeTypes << "application/x-lzma";
+        if ( havexz )
+            m_extractMimeTypes << "application/x-xz";
     }
 
     if ( !KStandardDirs::findExe( "lha" ).isNull() )