diff --git a/rtgui/filebrowserentry.cc b/rtgui/filebrowserentry.cc
index bbef581b6..68a5f9765 100644
--- a/rtgui/filebrowserentry.cc
+++ b/rtgui/filebrowserentry.cc
@@ -81,9 +81,9 @@ void FileBrowserEntry::refreshThumbnailImage () {
 }
 
 void FileBrowserEntry::refreshQuickThumbnailImage () {
-
+	// Only make a (slow) processed preview if the picture has been edited at all
     if ( thumbnail &&
-			thumbnail->isQuick() )
+			thumbnail->isQuick() && thumbnail->isPParamsValid() )
 	{
 		thumbImageUpdater->add(thumbnail, thumbnail->getProcParams(), preh, &updatepriority, true, this);    
 	}
diff --git a/rtgui/thumbnail.h b/rtgui/thumbnail.h
index 32da160e9..0373f4f3d 100644
--- a/rtgui/thumbnail.h
+++ b/rtgui/thumbnail.h
@@ -85,6 +85,7 @@ class Thumbnail {
         void              loadProcParams ();
 
 		bool              isQuick() { return quick_; }
+		bool              isPParamsValid() { return pparamsValid; }
         bool              isRecentlySaved ();
         void              imageDeveloped ();
         void              imageEnqueued ();