diff --git a/pkgs/applications/misc/calibre/default.nix b/pkgs/applications/misc/calibre/default.nix
index 0987f961baf..c74795f52c4 100644
--- a/pkgs/applications/misc/calibre/default.nix
+++ b/pkgs/applications/misc/calibre/default.nix
@@ -18,8 +18,9 @@ stdenv.mkDerivation rec {
 
   patchPhase = ''
     tar xf ${qt48.src}
+    qtdir=$(realpath $(ls | grep qt | grep 4.8 | grep src))
     sed -i setup/build_environment.py \
-        -e "s|^qt_private_inc = .*|qt_private_inc = ['../qt-everywhere-opensource-src-4.8.5/include/%s'%(m) for m in ('QtGui', 'QtCore')]|"
+        -e "s|^qt_private_inc = .*|qt_private_inc = ['$qtdir/include/%s\'%(m) for m in ('QtGui', 'QtCore')]|"
   '';
 
   buildInputs =