diff --git a/pkgs/development/libraries/apr/default.nix b/pkgs/development/libraries/apr/default.nix
index 1e9e292cc490..38b062e08b23 100644
--- a/pkgs/development/libraries/apr/default.nix
+++ b/pkgs/development/libraries/apr/default.nix
@@ -10,7 +10,7 @@ stdenv.mkDerivation rec {
 
   configureFlags =
     # Don't use accept4 because it's only supported on Linux >= 2.6.28.
-    [ " apr_cv_accept4=no" ]
+    [ "apr_cv_accept4=no" ]
     # 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";