diff --git a/pkgs/tools/admin/daemontools/default.nix b/pkgs/tools/admin/daemontools/default.nix
index 5594368b04f..7e8c1bccc3e 100644
--- a/pkgs/tools/admin/daemontools/default.nix
+++ b/pkgs/tools/admin/daemontools/default.nix
@@ -2,40 +2,42 @@
 
 stdenv.mkDerivation rec {
   name = "daemontools-0.76";
-  
+
   src = fetchurl {
     url = "https://cr.yp.to/daemontools/${name}.tar.gz";
     sha256 = "07scvw88faxkscxi91031pjkpccql6wspk4yrlnsbrrb5c0kamd5";
   };
-  
+
+  patches = [ ./fix-nix-usernamespace-build.patch ];
+
   configurePhase = ''
     cd ${name}
-    
+
     sed -ie '1 s_$_ -include ${glibc.dev}/include/errno.h_' src/conf-cc
-    
+
     substituteInPlace src/Makefile \
       --replace '/bin/sh' '${bash}/bin/bash -oxtrace'
-    
+
     sed -ie "s_^PATH=.*_PATH=$src/${name}/compile:''${PATH}_" src/rts.tests
-    
+
     cat ${glibc.dev}/include/errno.h
   '';
-  
+
   buildPhase = ''
     package/compile
   '';
-  
+
   installPhase = ''
     for cmd in $(cat package/commands); do
       install -Dm755 "command/$cmd" "$out/bin/$cmd"
     done
   '';
-  
+
   meta = {
     license = stdenv.lib.licenses.publicDomain;
     homepage = https://cr.yp.to/daemontools.html;
     description = "A collection of tools for managing UNIX services.";
-    
+
     maintainers = with stdenv.lib.maintainers; [ kevincox ];
     platforms = stdenv.lib.platforms.unix;
   };
diff --git a/pkgs/tools/admin/daemontools/fix-nix-usernamespace-build.patch b/pkgs/tools/admin/daemontools/fix-nix-usernamespace-build.patch
new file mode 100644
index 00000000000..9b784e7ca11
--- /dev/null
+++ b/pkgs/tools/admin/daemontools/fix-nix-usernamespace-build.patch
@@ -0,0 +1,10 @@
+--- admin.org/daemontools-0.76/src/chkshsgr.c	2001-07-12 17:49:49.000000000 +0100
++++ admin/daemontools-0.76/src/chkshsgr.c	2017-05-31 23:54:56.662174028 +0100
+@@ -4,6 +4,7 @@
+ 
+ int main()
+ {
++  return 0;
+   short x[4];
+ 
+   x[0] = x[1] = 0;