diff --git a/pkgs/development/libraries/qt-4.x/4.8/default.nix b/pkgs/development/libraries/qt-4.x/4.8/default.nix
index a54860ff0ac8..a73f63bfb4bf 100644
--- a/pkgs/development/libraries/qt-4.x/4.8/default.nix
+++ b/pkgs/development/libraries/qt-4.x/4.8/default.nix
@@ -128,7 +128,7 @@ stdenv.mkDerivation rec {
 
   postConfigure = ''
     echo "applying patch ${./parallel-build.patch}"
-    patch -p1 < ${./parallel-build.patch}
+    patch -p1 -i ${./parallel-build.patch}
   '';
 
   prefixKey = "-prefix ";
diff --git a/pkgs/development/libraries/qt-4.x/4.8/parallel-build.patch b/pkgs/development/libraries/qt-4.x/4.8/parallel-build.patch
index 5783543e8449..d471bb2a6653 100644
--- a/pkgs/development/libraries/qt-4.x/4.8/parallel-build.patch
+++ b/pkgs/development/libraries/qt-4.x/4.8/parallel-build.patch
@@ -1,6 +1,6 @@
 --- a/tools/designer/src/lib/Makefile
 +++ b/tools/designer/src/lib/Makefile
 @@ -7167,2 +7167,3 @@ compiler_moc_header_clean:
-                .uic/release-shared/ui_qtgradientviewdialog.h \
-+               .uic/release-shared/ui_qtgradientview.h \
-                ../../../shared/qtgradienteditor/qtgradientviewdialog.h
+ 		.uic/release-shared/ui_qtgradientviewdialog.h \
++		.uic/release-shared/ui_qtgradientview.h \
+ 		../../../shared/qtgradienteditor/qtgradientviewdialog.h