diff --git a/pkgs/tools/package-management/disnix/default.nix b/pkgs/tools/package-management/disnix/default.nix
index 27f055c089cb..6b72c775a522 100644
--- a/pkgs/tools/package-management/disnix/default.nix
+++ b/pkgs/tools/package-management/disnix/default.nix
@@ -1,4 +1,4 @@
-{ lib, stdenv, fetchurl, pkg-config, glib, libxml2, libxslt, getopt, dysnomia, libintl, libiconv }:
+{ lib, stdenv, fetchurl, fetchpatch, pkg-config, glib, libxml2, libxslt, getopt, dysnomia, libintl, libiconv }:
 
 stdenv.mkDerivation rec {
   pname = "disnix";
@@ -9,6 +9,16 @@ stdenv.mkDerivation rec {
     sha256 = "0mc0wy8fca60w0d56cljq2cw1xigbp2dklb43fxa5xph94j3i49a";
   };
 
+  patches = [
+    # https://github.com/svanderburg/disnix/pull/21
+    # fix implicit function declaration
+    (fetchpatch {
+      name = "add-stdlib.h.patch";
+      url = "https://github.com/svanderburg/disnix/commit/aa969f1d152acb35fc70c6c8db249b61f5a9eb41.patch";
+      hash = "sha256-RZNVVdZ7Rx8n7qzbJOw8BHL8f07mvh8IKpfsWexuVLU=";
+    })
+  ];
+
   nativeBuildInputs = [ pkg-config ];
   buildInputs = [ glib libxml2 libxslt getopt libintl libiconv dysnomia ];