diff --git a/pkgs/build-support/build-pecl.nix b/pkgs/build-support/build-pecl.nix
index ce948739c32..738dbb56708 100644
--- a/pkgs/build-support/build-pecl.nix
+++ b/pkgs/build-support/build-pecl.nix
@@ -22,6 +22,4 @@ stdenv.mkDerivation (args // {
   makeFlags = [ "EXTENSION_DIR=$(out)/lib/php/extensions" ] ++ makeFlags;
 
   autoreconfPhase = "phpize";
-
-  preConfigure = "touch unix.h";
 })