diff --git a/src/libstore/gc.cc b/src/libstore/gc.cc
index ab2c5ca02..943b16c28 100644
--- a/src/libstore/gc.cc
+++ b/src/libstore/gc.cc
@@ -324,10 +324,8 @@ Roots LocalStore::findRootsNoTemp()
 {
     Roots roots;
 
-    /* Process direct roots in {gcroots,manifests,profiles}. */
+    /* Process direct roots in {gcroots,profiles}. */
     findRoots(stateDir + "/" + gcRootsDir, DT_UNKNOWN, roots);
-    if (pathExists(stateDir + "/manifests"))
-        findRoots(stateDir + "/manifests", DT_UNKNOWN, roots);
     findRoots(stateDir + "/profiles", DT_UNKNOWN, roots);
 
     /* Add additional roots returned by the program specified by the
diff --git a/tests/common.sh.in b/tests/common.sh.in
index 186f9d6b9..195205988 100644
--- a/tests/common.sh.in
+++ b/tests/common.sh.in
@@ -11,7 +11,6 @@ export NIX_LOCALSTATE_DIR=$TEST_ROOT/var
 export NIX_LOG_DIR=$TEST_ROOT/var/log/nix
 export NIX_STATE_DIR=$TEST_ROOT/var/nix
 export NIX_CONF_DIR=$TEST_ROOT/etc
-export NIX_MANIFESTS_DIR=$TEST_ROOT/var/nix/manifests
 export _NIX_TEST_SHARED=$TEST_ROOT/shared
 if [[ -n $NIX_STORE ]]; then
     export _NIX_TEST_NO_SANDBOX=1