diff --git a/src/libstore/build.cc b/src/libstore/build.cc
index d75ca0be8..cd37f7a3f 100644
--- a/src/libstore/build.cc
+++ b/src/libstore/build.cc
@@ -2007,7 +2007,7 @@ void DerivationGoal::startBuilder()
 
         /* Create /etc/hosts with localhost entry. */
         if (!fixedOutput)
-            writeFile(chrootRootDir + "/etc/hosts", "127.0.0.1 localhost\n");
+            writeFile(chrootRootDir + "/etc/hosts", "127.0.0.1 localhost\n::1 localhost\n");
 
         /* Make the closure of the inputs available in the chroot,
            rather than the whole Nix store.  This prevents any access