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-rw-r--r--src/libstore/build.cc11
1 files changed, 6 insertions, 5 deletions
diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index f4478a4db2f0..d0d051f0812e 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -1566,16 +1566,17 @@ void DerivationGoal::startBuilder()
         createDirs(chrootTmpDir);
         chmod(chrootTmpDir, 01777);
 
-        /* Create a /etc/passwd with entries for the build user and
-           the nobody account.  The latter is kind of a hack to
-           support Samba-in-QEMU. */
+        /* Create a /etc/passwd with entries for the build user and the
+           nobody account.  The latter is kind of a hack to support
+           Samba-in-QEMU.  */
         createDirs(chrootRootDir + "/etc");
 
         writeFile(chrootRootDir + "/etc/passwd",
             (format(
-                "nixbld:x:%1%:65534:Nix build user:/:/noshell\n"
+                "nixbld:x:%1%:%2%:Nix build user:/:/noshell\n"
                 "nobody:x:65534:65534:Nobody:/:/noshell\n")
-                % (buildUser.enabled() ? buildUser.getUID() : getuid())).str());
+                % (buildUser.enabled() ? buildUser.getUID() : getuid())
+                % (buildUser.enabled() ? buildUser.getGID() : getgid())).str());
 
         /* Bind-mount a user-configurable set of directories from the
            host file system.  The `/dev/pts' directory must be mounted