diff --git a/pkgs/development/tools/build-managers/ninja/default.nix b/pkgs/development/tools/build-managers/ninja/default.nix
index 4f28ab86ffd..8cce2b88317 100644
--- a/pkgs/development/tools/build-managers/ninja/default.nix
+++ b/pkgs/development/tools/build-managers/ninja/default.nix
@@ -1,4 +1,4 @@
-{ stdenv, fetchFromGitHub, python, buildDocs ? true, asciidoc, docbook_xml_dtd_45, docbook_xsl, libxslt, re2c }:
+{ stdenv, fetchFromGitHub, fetchpatch, python, buildDocs ? true, asciidoc, docbook_xml_dtd_45, docbook_xsl, libxslt, re2c }:
 
 with stdenv.lib;
 
@@ -13,6 +13,15 @@ stdenv.mkDerivation rec {
     sha256 = "1q0nld3g0d210zmdjyjzjz2xb2bw1s58gj6zsx7p8q30yh0wg610";
   };
 
+  patches = [
+    # Make builds reproducible by generating the same IDs from the same inputs.
+    (fetchpatch {
+      name = "consistent-doc-ids";
+      url = "https://github.com/ninja-build/ninja/commit/9aa947471fcfc607bec6d92a1a6eed5c692edbaf.patch";
+      sha256 = "0zsg46jflsh644jccrcgyfalr7fkzrv041kyi8644nyk923gcrl9";
+    })
+  ];
+
   nativeBuildInputs = [ python re2c ] ++ optionals buildDocs [ asciidoc docbook_xml_dtd_45 docbook_xsl libxslt.bin ];
 
   buildPhase = ''