diff --git a/.gitignore b/.gitignore
index e91c25f9d..5c95bb8a7 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,6 +14,7 @@ git-rev
 kpdfview
 slider_watcher
 *.o
+tags
 
 kindlepdfviewer-*.zip
 
@@ -46,3 +47,4 @@ popen-noshell/popen_noshell_examples.c
 popen-noshell/popen_noshell_tests.c
 popen-noshell/popen_noshell_tests.cpp
 
+kpvcrlib/libcrengine.so
diff --git a/frontend/ui/reader/readercropping.lua b/frontend/ui/reader/readercropping.lua
index 3fe8aee1e..5c4dcf793 100644
--- a/frontend/ui/reader/readercropping.lua
+++ b/frontend/ui/reader/readercropping.lua
@@ -7,7 +7,7 @@ PageCropDialog = VerticalGroup:new{
 	cancel_text = "Cancel",
 	ok_callback = function() end,
 	cancel_callback = function() end,
-	button_width = math.floor(70*Screen:getDPI()/167),
+	button_width = math.floor(scaleByDPI(70)),
 }
 
 function PageCropDialog:init()