diff --git a/rtdata/languages/default b/rtdata/languages/default
index f394f80d2..6a8bae887 100644
--- a/rtdata/languages/default
+++ b/rtdata/languages/default
@@ -963,7 +963,8 @@ PREFERENCES_BEHSETALL;All to 'Set'
 PREFERENCES_BEHSETALLHINT;Set all parameters to the <b>Set</b> mode.\nAdjustments of parameters in the batch tool panel will be <b>absolute</b>, the actual values will be displayed.
 PREFERENCES_BLACKBODY;Tungsten
 PREFERENCES_CACHECLEARALL;Clear All
-PREFERENCES_CACHECLEARPROFILES;Clear Processing Profiles
+PREFERENCES_CACHECLEARPROFILES;Clear pp3
+PREFERENCES_CACHECLEARMIP;Clear mip
 PREFERENCES_CACHECLEARTHUMBS;Clear Thumbnails
 PREFERENCES_CACHEMAXENTRIES;Maximum number of cache entries
 PREFERENCES_CACHEOPTS;Cache Options
diff --git a/rtgui/cachemanager.cc b/rtgui/cachemanager.cc
index b391ad50c..2eb8a7ba0 100644
--- a/rtgui/cachemanager.cc
+++ b/rtgui/cachemanager.cc
@@ -256,6 +256,13 @@ void CacheManager::clearProfiles () const
     MyMutex::MyLock lock (mutex);
 
     deleteDir ("profiles");
+
+}
+
+void CacheManager::clearmip () const
+{
+    MyMutex::MyLock lock (mutex);
+
     deleteDir ("mip");
 
 }
diff --git a/rtgui/cachemanager.h b/rtgui/cachemanager.h
index 99c732e88..7d63608ff 100644
--- a/rtgui/cachemanager.h
+++ b/rtgui/cachemanager.h
@@ -59,6 +59,7 @@ public:
     void clearAll () const;
     void clearImages () const;
     void clearProfiles () const;
+    void clearmip () const;
     void clearFromCache (const Glib::ustring& fname, bool purge) const;
 
     static std::string getMD5 (const Glib::ustring& fname);
diff --git a/rtgui/preferences.cc b/rtgui/preferences.cc
index feb38b6ea..9eb4f34d4 100644
--- a/rtgui/preferences.cc
+++ b/rtgui/preferences.cc
@@ -1396,9 +1396,11 @@ Gtk::Widget* Preferences::getFileBrowserPanel ()
     Gtk::HBox* hb5 = Gtk::manage ( new Gtk::HBox () );
     clearThumbnails = Gtk::manage ( new Gtk::Button (M ("PREFERENCES_CACHECLEARTHUMBS")) );
     clearProfiles = Gtk::manage ( new Gtk::Button (M ("PREFERENCES_CACHECLEARPROFILES")) );
+    clearmip = Gtk::manage ( new Gtk::Button (M ("PREFERENCES_CACHECLEARMIP")) );
     clearAll = Gtk::manage ( new Gtk::Button (M ("PREFERENCES_CACHECLEARALL")) );
     hb5->pack_start (*clearThumbnails, Gtk::PACK_SHRINK, 4);
     hb5->pack_start (*clearProfiles, Gtk::PACK_SHRINK, 4);
+    hb5->pack_start (*clearmip, Gtk::PACK_SHRINK, 4);
     hb5->pack_start (*clearAll, Gtk::PACK_SHRINK, 4);
     vbc->pack_start (*hb5, Gtk::PACK_SHRINK, 4);
 
@@ -1414,9 +1416,9 @@ Gtk::Widget* Preferences::getFileBrowserPanel ()
 
     mvbfb->pack_start (*hb6, Gtk::PACK_SHRINK, 4);
 
-//  mvbfb->pack_start (*fro, Gtk::PACK_SHRINK, 4);
-//  mvbfb->pack_start (*fre);
-//  mvbfb->pack_start (*frc, Gtk::PACK_SHRINK, 4);
+// mvbfb->pack_start (*fro, Gtk::PACK_SHRINK, 4);
+// mvbfb->pack_start (*fre);
+// mvbfb->pack_start (*frc, Gtk::PACK_SHRINK, 4);
 
     addExt->signal_clicked().connect ( sigc::mem_fun (*this, &Preferences::addExtPressed) );
     delExt->signal_clicked().connect ( sigc::mem_fun (*this, &Preferences::delExtPressed) );
@@ -1425,6 +1427,7 @@ Gtk::Widget* Preferences::getFileBrowserPanel ()
     extension->signal_activate().connect ( sigc::mem_fun (*this, &Preferences::addExtPressed) );
     clearThumbnails->signal_clicked().connect ( sigc::mem_fun (*this, &Preferences::clearThumbImagesPressed) );
     clearProfiles->signal_clicked().connect ( sigc::mem_fun (*this, &Preferences::clearProfilesPressed) );
+    clearmip->signal_clicked().connect ( sigc::mem_fun (*this, &Preferences::clearmipPressed) );
     clearAll->signal_clicked().connect ( sigc::mem_fun (*this, &Preferences::clearAllPressed) );
 
     return mvbfb;
@@ -2443,6 +2446,12 @@ void Preferences::clearProfilesPressed ()
     cacheMgr->clearProfiles ();
 }
 
+void Preferences::clearmipPressed ()
+{
+
+    cacheMgr->clearmip ();
+}
+
 void Preferences::clearThumbImagesPressed ()
 {
 
diff --git a/rtgui/preferences.h b/rtgui/preferences.h
index 07a56b73b..c9f36e178 100644
--- a/rtgui/preferences.h
+++ b/rtgui/preferences.h
@@ -152,6 +152,7 @@ class Preferences : public Gtk::Dialog, public ProfileStoreListener
     Gtk::SpinButton*   maxRecentFolders;
     Gtk::Button*       clearThumbnails;
     Gtk::Button*       clearProfiles;
+    Gtk::Button*       clearmip;
     Gtk::Button*       clearAll;
     Gtk::Entry*     extension;
     Gtk::TreeView*  extensions;
@@ -263,6 +264,7 @@ public:
     void darkFrameChanged ();
     void flatFieldChanged ();
     void clearProfilesPressed ();
+    void clearmipPressed ();
     void clearThumbImagesPressed ();
     void clearAllPressed ();