diff --git a/src/filewidgets/kfilepreviewgenerator.cpp b/src/filewidgets/kfilepreviewgenerator.cpp
--- a/src/filewidgets/kfilepreviewgenerator.cpp
+++ b/src/filewidgets/kfilepreviewgenerator.cpp
@@ -49,6 +49,8 @@
 #include <QScrollBar>
 #include <QIcon>
 
+#include <QDebug>
+
 #if HAVE_X11 && HAVE_XRENDER
 #  include <QX11Info>
 #  include <X11/Xlib.h>
@@ -1017,7 +1019,7 @@
             icon = icon.scaled(maxSize, Qt::KeepAspectRatio, Qt::FastTransformation);
         }
 #else
-        icon = icon.scaled(maxSize, Qt::KeepAspectRatio, Qt::FastTransformation);
+        icon = icon.scaled(maxSize * 4, Qt::KeepAspectRatio, Qt::FastTransformation).scaled(maxSize, Qt::KeepAspectRatio, Qt::SmoothTransformation);
 #endif
     }
 }