diff --git a/pkgs/development/libraries/apr/default.nix b/pkgs/development/libraries/apr/default.nix
index 8c3d5c03496..07a565596bb 100644
--- a/pkgs/development/libraries/apr/default.nix
+++ b/pkgs/development/libraries/apr/default.nix
@@ -20,7 +20,7 @@ stdenv.mkDerivation rec {
     # Including the Windows headers breaks unistd.h.
     # Based on ftp://sourceware.org/pub/cygwin/release/libapr1/libapr1-1.3.8-2-src.tar.bz2
     ++ stdenv.lib.optional (stdenv.system == "i686-cygwin") "ac_cv_header_windows_h=no";
-  
+
   meta = {
     homepage = http://apr.apache.org/;
     description = "The Apache Portable Runtime library";