diff --git a/pkgs/applications/misc/calibre/default.nix b/pkgs/applications/misc/calibre/default.nix
index 559a4d3ea0bb..0987f961bafd 100644
--- a/pkgs/applications/misc/calibre/default.nix
+++ b/pkgs/applications/misc/calibre/default.nix
@@ -19,7 +19,7 @@ stdenv.mkDerivation rec {
   patchPhase = ''
     tar xf ${qt48.src}
     sed -i setup/build_environment.py \
-        -e "s|^qt_private_inc = .*|qt_private_inc = ['%s/%s'%('`pwd`/qt-everywhere-opensource-src-4.8.5/include', m) for m in ('QtGui', 'QtCore')]|"
+        -e "s|^qt_private_inc = .*|qt_private_inc = ['../qt-everywhere-opensource-src-4.8.5/include/%s'%(m) for m in ('QtGui', 'QtCore')]|"
   '';
 
   buildInputs =