diff --git a/t/Makefile.am b/t/Makefile.am
index 4f84154c..358f3698 100644
--- a/t/Makefile.am
+++ b/t/Makefile.am
@@ -8,10 +8,8 @@ TESTS_ENVIRONMENT = \
   NIX_REMOTE_SYSTEMS=					\
   NIX_CONF_DIR="$(abs_builddir)/nix/etc/nix"		\
   NIX_STATE_DIR="$(abs_builddir)/nix/var/nix"		\
-  NIX_MANIFESTS_DIR="$(abs_builddir)/nix/var/nix/manifests"	\
   NIX_STORE_DIR="$(abs_builddir)/nix/store"			\
   NIX_LOG_DIR="$(abs_builddir)/nix/var/log/nix"		\
-  NIX_BUILD_HOOK=					\
   PGHOST=/tmp	\
   PERL5LIB="$(srcdir):$(abs_top_srcdir)/src/lib:$$PERL5LIB"	\
   PYTHONPATH= \
diff --git a/t/lib/Setup.pm b/t/lib/Setup.pm
index cdea38ce..a246b653 100644
--- a/t/lib/Setup.pm
+++ b/t/lib/Setup.pm
@@ -56,8 +56,6 @@ sub test_init {
     close $fh;
 
     $ENV{'NIX_STATE_DIR'} = "$dir/nix/var/nix";
-
-    $ENV{'NIX_MANIFESTS_DIR'} = "$dir/nix/var/nix/manifests";
     $ENV{'NIX_STORE_DIR'} = "$dir/nix/store";
     $ENV{'NIX_LOG_DIR'} = "$dir/nix/var/log/nix";