diff --git a/tests/Makefile.am b/tests/Makefile.am
index aceb5d33b..a16051f73 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -3,7 +3,7 @@ TESTS_ENVIRONMENT = $(bash) -e
 extra1 = $(shell pwd)/test-tmp/shared
 
 TESTS = init.sh hash.sh lang.sh add.sh simple.sh dependencies.sh \
-  locking.sh parallel.sh build-hook.sh substitutes.sh substitutes2.sh \
+  parallel.sh build-hook.sh substitutes.sh substitutes2.sh \
   fallback.sh nix-push.sh gc.sh gc-concurrent.sh verify.sh nix-pull.sh \
   referrers.sh user-envs.sh logging.sh nix-build.sh misc.sh fixed.sh \
   gc-runtime.sh install-package.sh check-refs.sh filter-source.sh \
@@ -20,7 +20,6 @@ EXTRA_DIST = $(TESTS) \
   simple.nix simple.builder.sh \
   hash-check.nix \
   dependencies.nix dependencies.builder*.sh \
-  locking.nix locking.builder.sh \
   parallel.nix parallel.builder.sh \
   build-hook.nix build-hook.hook.sh \
   substituter.sh substituter2.sh \
diff --git a/tests/locking.builder.sh b/tests/locking.builder.sh
deleted file mode 100644
index 4cb5eb379..000000000
--- a/tests/locking.builder.sh
+++ /dev/null
@@ -1,6 +0,0 @@
-sleep 3
-
-# Use `>>'; without proper locking this will cause text duplication.
-echo -n $(cat $inputs)$text >> $out
-
-sleep 2
\ No newline at end of file
diff --git a/tests/locking.nix b/tests/locking.nix
deleted file mode 100644
index a0407685b..000000000
--- a/tests/locking.nix
+++ /dev/null
@@ -1,17 +0,0 @@
-with import ./config.nix;
-
-let
-
-  mkDrv = text: inputs: mkDerivation {
-    name = "locking";
-    builder = ./locking.builder.sh;
-    inherit text inputs;
-  };
-
-  a = mkDrv "a" [];
-  b = mkDrv "b" [a];
-  c = mkDrv "c" [a b];
-  d = mkDrv "d" [a];
-  e = mkDrv "e" [c d];
-
-in e
diff --git a/tests/locking.sh b/tests/locking.sh
deleted file mode 100644
index 4b41de391..000000000
--- a/tests/locking.sh
+++ /dev/null
@@ -1,19 +0,0 @@
-source common.sh
-
-drvPath=$($nixinstantiate locking.nix)
-
-echo "derivation is $drvPath"
-
-for i in 1 2 3 4 5; do
-    echo "WORKER $i"
-    $nixstore -rvv "$drvPath" &
-done
-
-sleep 5
-
-outPath=$($nixstore -qvvf "$drvPath")
-
-echo "output path is $outPath"
-
-text=$(cat "$outPath")
-if test "$text" != "aabcade"; then exit 1; fi
diff --git a/tests/parallel.sh b/tests/parallel.sh
index 798c15f5b..ddfb1523b 100644
--- a/tests/parallel.sh
+++ b/tests/parallel.sh
@@ -1,5 +1,6 @@
 source common.sh
 
+
 # First, test that -jN performs builds in parallel.
 echo "testing nix-build -j..."
 
@@ -17,6 +18,7 @@ if test "$text" != "abacade"; then exit 1; fi
 if test "$(cat $SHARED.cur)" != 0; then fail "wrong current process count"; fi
 if test "$(cat $SHARED.max)" != 3; then fail "not enough parallelism"; fi
 
+
 # Second, test that parallel invocations of nix-build perform builds
 # in parallel, and don't block waiting on locks held by the others.
 echo "testing multiple nix-build -j1..."
@@ -25,7 +27,9 @@ clearStore
 
 rm -f $SHARED.cur $SHARED.max
 
-cmd="$nixbuild -j1 parallel.nix --argstr sleepTime 7"
+drvPath=$($nixinstantiate parallel.nix --argstr sleepTime 7)
+
+cmd="$nixstore -j1 -r $drvPath"
 
 $cmd &
 pid1=$!
@@ -39,9 +43,14 @@ $cmd &
 pid3=$!
 echo "pid 3 is $pid3"
 
+$cmd &
+pid4=$!
+echo "pid 4 is $pid4"
+
 wait $pid1 || fail "instance 1 failed: $?"
 wait $pid2 || fail "instance 2 failed: $?"
 wait $pid3 || fail "instance 3 failed: $?"
+wait $pid4 || fail "instance 4 failed: $?"
 
 if test "$(cat $SHARED.cur)" != 0; then fail "wrong current process count"; fi
 if test "$(cat $SHARED.max)" != 3; then fail "not enough parallelism"; fi