diff --git a/api/rankdb.go b/api/rankdb.go
index e9c41d3..341249b 100644
--- a/api/rankdb.go
+++ b/api/rankdb.go
@@ -71,6 +71,7 @@ var (
 		Aerospike           struct {
 			Hosts          string
 			Namespace      string
+			KeyPrefix      string
 			WriteBlockSize int // See http://www.aerospike.com/docs/reference/configuration#write-block-size
 		}
 
@@ -300,7 +301,7 @@ func newBlobstore(ctx context.Context, s string) (store blobstore.Store, closers
 	case "Memory":
 		store = memstore.NewMemStore()
 	case "Aerospike":
-		as, err := aerostore.New(config.Aerospike.Namespace, config.Aerospike.Hosts)
+		as, err := aerostore.New(config.Aerospike.Namespace, config.Aerospike.KeyPrefix, config.Aerospike.Hosts)
 		if err != nil {
 			return nil, nil, err
 		}
diff --git a/blobstore/aerostore/aerostore.go b/blobstore/aerostore/aerostore.go
index fa65581..17a0d53 100644
--- a/blobstore/aerostore/aerostore.go
+++ b/blobstore/aerostore/aerostore.go
@@ -24,8 +24,9 @@ type AeroStore struct {
 	WritePolicy *as.WritePolicy
 	BasePolicy  *as.BasePolicy
 
-	c  *as.Client
-	ns string
+	c         *as.Client
+	ns        string
+	keyPrefix string
 }
 
 // New creates a storage with the supplied namespace.
@@ -33,7 +34,7 @@ type AeroStore struct {
 // If no port is given on hosts, port 3000 is assumed.
 // It is highly recommended to include a MaxSizeStore prior to this
 // matching maximum storage size.
-func New(namespace, hosts string) (*AeroStore, error) {
+func New(namespace, keyPrefix, hosts string) (*AeroStore, error) {
 	var h []*as.Host
 	for _, hwp := range parseHosts(hosts, 3000) {
 		h = append(h, as.NewHost(hwp.Name, hwp.Port))
@@ -54,11 +55,19 @@ func New(namespace, hosts string) (*AeroStore, error) {
 		BasePolicy:  as.NewPolicy(),
 		c:           cl,
 		ns:          namespace,
+		keyPrefix:   keyPrefix,
 	}, nil
 }
 
+func (a *AeroStore) prefix(key string) string {
+	if a.keyPrefix == "" {
+		return key
+	}
+	return fmt.Sprintf("%s_%s", a.keyPrefix, key)
+}
+
 func (a *AeroStore) Get(ctx context.Context, set, key string) ([]byte, error) {
-	k, err := as.NewKey(a.ns, set, key)
+	k, err := as.NewKey(a.ns, set, a.prefix(key))
 	if err != nil {
 		log.Error(ctx, err.Error())
 		return nil, err
@@ -88,7 +97,7 @@ func (a *AeroStore) Get(ctx context.Context, set, key string) ([]byte, error) {
 }
 
 func (a *AeroStore) Delete(ctx context.Context, set, key string) error {
-	k, err := as.NewKey(a.ns, set, key)
+	k, err := as.NewKey(a.ns, set, a.prefix(key))
 	if err != nil {
 		log.Error(ctx, err.Error())
 		return err
@@ -101,7 +110,7 @@ func (a *AeroStore) Set(ctx context.Context, set, key string, val []byte) error
 	if len(val) > 1<<20 {
 		return blobstore.ErrBlobTooBig
 	}
-	k, err := as.NewKey(a.ns, set, key)
+	k, err := as.NewKey(a.ns, set, a.prefix(key))
 	if err != nil {
 		return err
 	}
diff --git a/conf/conf.test.toml b/conf/conf.test.toml
index 20e7d5a..eba0eb7 100644
--- a/conf/conf.test.toml
+++ b/conf/conf.test.toml
@@ -84,6 +84,8 @@ BackupEvery = 10
 Hosts = ""
 # Namespace used for storage.
 Namespace = "api"
+# KeyPrefix used to isolate keys in namespaces
+KeyPrefix = ""
 # Must match write-block-size of server.
 # See http://www.aerospike.com/docs/reference/configuration#write-block-size
 WriteBlockSize = 1048576