diff --git a/go.sum b/go.sum
index 8d4fd79..d128972 100644
--- a/go.sum
+++ b/go.sum
@@ -6,6 +6,7 @@ github.com/jbenet/goprocess v0.0.0-20160826012719-b497e2f366b8 h1:bspPhN+oKYFk5f
 github.com/jbenet/goprocess v0.0.0-20160826012719-b497e2f366b8/go.mod h1:Ly/wlsjFq/qrU3Rar62tu1gASgGw6chQbSh/XgIIXCY=
 github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
 github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
+github.com/kr/pty v1.1.1 h1:VkoXIwSboBpnk99O/KFauAEILuNHv5DVFKZMBN/gUgw=
 github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
 github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
 github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
diff --git a/mount/mount_test.go b/mount/mount_test.go
index 7d88b0a..a3059b4 100644
--- a/mount/mount_test.go
+++ b/mount/mount_test.go
@@ -841,9 +841,9 @@ func TestSuite(t *testing.T) {
 	mapds2 := datastore.NewMapDatastore()
 	mapds3 := datastore.NewMapDatastore()
 	m := mount.New([]mount.Mount{
-		{Prefix: datastore.NewKey("/foo"), Datastore: mapds1},
-		{Prefix: datastore.NewKey("/bar"), Datastore: mapds2},
-		{Prefix: datastore.NewKey("/baz"), Datastore: mapds3},
+		{Prefix: datastore.NewKey("/prefix"), Datastore: mapds1},
+		{Prefix: datastore.NewKey("/prefix/sub"), Datastore: mapds2},
+		{Prefix: datastore.NewKey("/0"), Datastore: mapds3},
 		{Prefix: datastore.NewKey("/"), Datastore: mapds0},
 	})
 	dstest.SubtestAll(t, m)
diff --git a/test/basic_tests.go b/test/basic_tests.go
index 0506ee5..6b8d10d 100644
--- a/test/basic_tests.go
+++ b/test/basic_tests.go
@@ -177,27 +177,27 @@ func SubtestManyKeysAndQuery(t *testing.T, ds dstore.Datastore) {
 }
 
 func SubtestBasicSync(t *testing.T, ds dstore.Datastore) {
-	if err := ds.Sync(dstore.NewKey("foo")); err != nil {
+	if err := ds.Sync(dstore.NewKey("prefix")); err != nil {
 		t.Fatal(err)
 	}
 
-	if err := ds.Put(dstore.NewKey("/foo"), []byte("foo")); err != nil {
+	if err := ds.Put(dstore.NewKey("/prefix"), []byte("foo")); err != nil {
 		t.Fatal(err)
 	}
 
-	if err := ds.Sync(dstore.NewKey("/foo")); err != nil {
+	if err := ds.Sync(dstore.NewKey("/prefix")); err != nil {
 		t.Fatal(err)
 	}
 
-	if err := ds.Put(dstore.NewKey("/foo/bar"), []byte("bar")); err != nil {
+	if err := ds.Put(dstore.NewKey("/prefix/sub"), []byte("bar")); err != nil {
 		t.Fatal(err)
 	}
 
-	if err := ds.Sync(dstore.NewKey("/foo")); err != nil {
+	if err := ds.Sync(dstore.NewKey("/prefix")); err != nil {
 		t.Fatal(err)
 	}
 
-	if err := ds.Sync(dstore.NewKey("/foo/bar")); err != nil {
+	if err := ds.Sync(dstore.NewKey("/prefix/sub")); err != nil {
 		t.Fatal(err)
 	}
 
@@ -237,6 +237,11 @@ func SubtestCombinations(t *testing.T, ds dstore.Datastore) {
 			Key: "/2",
 		}},
 	}
+	prefixes := []string{
+		"",
+		"/prefix",
+		"/0", // keys exist under this prefix but they shouldn't match.
+	}
 	orders := [][]dsq.Order{
 		{dsq.OrderByKey{}},
 		{dsq.OrderByKeyDescending{}},
@@ -255,8 +260,9 @@ func SubtestCombinations(t *testing.T, ds dstore.Datastore) {
 				Limit:   limits[perm[1]],
 				Filters: filters[perm[2]],
 				Orders:  orders[perm[3]],
+				Prefix:  prefixes[perm[4]],
 			}
-			length := lengths[perm[4]]
+			length := lengths[perm[5]]
 
 			t.Run(strings.ReplaceAll(fmt.Sprintf("%d/{%s}", length, q), " ", "·"), func(t *testing.T) {
 				subtestQuery(t, ds, q, length)
@@ -266,6 +272,7 @@ func SubtestCombinations(t *testing.T, ds dstore.Datastore) {
 		len(limits),
 		len(filters),
 		len(orders),
+		len(prefixes),
 		len(lengths),
 	)
 }
@@ -335,6 +342,28 @@ func SubtestReturnSizes(t *testing.T, ds dstore.Datastore) {
 	subtestQuery(t, ds, dsq.Query{ReturnsSizes: true}, 100)
 }
 
+func SubtestPrefix(t *testing.T, ds dstore.Datastore) {
+	test := func(prefix string) {
+		t.Run(prefix, func(t *testing.T) {
+			subtestQuery(t, ds, dsq.Query{
+				Prefix: prefix,
+			}, 100)
+		})
+	}
+	test("")
+	test("/")
+	test("/./")
+	test("/.././/")
+	test("/prefix/../")
+
+	test("/prefix")
+	test("/prefix/")
+	test("/prefix/sub/")
+
+	test("/0/")
+	test("/bad/")
+}
+
 func randValue() []byte {
 	value := make([]byte, 64)
 	rand.Read(value)
@@ -354,6 +383,28 @@ func subtestQuery(t *testing.T, ds dstore.Datastore, q dsq.Query, count int) {
 		})
 	}
 
+	for i := 0; i < count; i++ {
+		s := fmt.Sprintf("/prefix/%dkey%d", i, i)
+		key := dstore.NewKey(s).String()
+		value := randValue()
+		input = append(input, dsq.Entry{
+			Key:   key,
+			Size:  len(value),
+			Value: value,
+		})
+	}
+
+	for i := 0; i < count; i++ {
+		s := fmt.Sprintf("/prefix/sub/%dkey%d", i, i)
+		key := dstore.NewKey(s).String()
+		value := randValue()
+		input = append(input, dsq.Entry{
+			Key:   key,
+			Size:  len(value),
+			Value: value,
+		})
+	}
+
 	t.Logf("putting %d values", count)
 	for i, e := range input {
 		err := ds.Put(dstore.RawKey(e.Key), e.Value)
diff --git a/test/suite.go b/test/suite.go
index afebd1c..012f802 100644
--- a/test/suite.go
+++ b/test/suite.go
@@ -14,6 +14,7 @@ var BasicSubtests = []func(t *testing.T, ds dstore.Datastore){
 	SubtestBasicPutGet,
 	SubtestNotFounds,
 	SubtestCombinations,
+	SubtestPrefix,
 	SubtestOrder,
 	SubtestLimit,
 	SubtestFilter,