diff --git a/badger/badger.go b/badger/badger.go
index c0dbdcb2..839b54be 100644
--- a/badger/badger.go
+++ b/badger/badger.go
@@ -18,6 +18,7 @@ type Storage struct {
 
 // ErrNotFound means that a get call did not find the requested key.
 var ErrNotFound = errors.New("key not found")
+var ErrKeyNotExist = ErrNotFound
 
 // New creates a new memory storage
 func New(config ...Config) *Storage {
diff --git a/dynamodb/dynamodb.go b/dynamodb/dynamodb.go
index 0692938a..8ab98ab2 100644
--- a/dynamodb/dynamodb.go
+++ b/dynamodb/dynamodb.go
@@ -21,6 +21,7 @@ type Storage struct {
 
 // ErrNotFound means that a get call did not find the requested key.
 var ErrNotFound = errors.New("key not found")
+var ErrKeyNotExist = ErrNotFound
 
 // New creates a new storage
 func New(config Config) *Storage {
diff --git a/memcache/memcache.go b/memcache/memcache.go
index a30d7163..184992f3 100644
--- a/memcache/memcache.go
+++ b/memcache/memcache.go
@@ -19,6 +19,7 @@ type Storage struct {
 
 // ErrNotFound means that a get call did not find the requested key.
 var ErrNotFound = errors.New("key not found")
+var ErrKeyNotExist = ErrNotFound
 
 // New creates a new storage
 func New(config ...Config) *Storage {
diff --git a/memory/memory.go b/memory/memory.go
index 7c434fd3..f4c118d9 100644
--- a/memory/memory.go
+++ b/memory/memory.go
@@ -17,6 +17,7 @@ type Storage struct {
 
 // ErrNotFound means that a get call did not find the requested key.
 var ErrNotFound = errors.New("key not found")
+var ErrKeyNotExist = ErrNotFound
 
 type entry struct {
 	data   []byte
diff --git a/mongodb/mongodb.go b/mongodb/mongodb.go
index 398f4552..ee89e5f2 100644
--- a/mongodb/mongodb.go
+++ b/mongodb/mongodb.go
@@ -24,6 +24,7 @@ type Storage struct {
 
 // ErrNotFound means that a get call did not find the requested key.
 var ErrNotFound = errors.New("key not found")
+var ErrKeyNotExist = ErrNotFound
 
 type item struct {
 	ObjectID   primitive.ObjectID `json:"_id,omitempty" bson:"_id,omitempty"`
diff --git a/mysql/mysql.go b/mysql/mysql.go
index c69f06bc..9972fff6 100644
--- a/mysql/mysql.go
+++ b/mysql/mysql.go
@@ -26,6 +26,7 @@ type Storage struct {
 
 // ErrNotFound means that a get call did not find the requested key.
 var ErrNotFound = errors.New("key not found")
+var ErrKeyNotExist = ErrNotFound
 
 var (
 	dropQuery = "DROP TABLE IF EXISTS %s;"
diff --git a/postgres/postgres.go b/postgres/postgres.go
index ab4f5b64..db0d3f97 100644
--- a/postgres/postgres.go
+++ b/postgres/postgres.go
@@ -24,9 +24,9 @@ type Storage struct {
 	sqlGC     string
 }
 
-
 // ErrNotFound means that a get call did not find the requested key.
 var ErrNotFound = errors.New("key not found")
+var ErrKeyNotExist = ErrNotFound
 
 var (
 	dropQuery = `DROP TABLE IF EXISTS %s;`
diff --git a/redis/redis.go b/redis/redis.go
index e801d03b..3ce9ac9b 100644
--- a/redis/redis.go
+++ b/redis/redis.go
@@ -16,6 +16,7 @@ type Storage struct {
 
 // ErrNotFound means that a get call did not find the requested key.
 var ErrNotFound = errors.New("key not found")
+var ErrKeyNotExist = ErrNotFound
 
 // New creates a new redis storage
 func New(config ...Config) *Storage {
diff --git a/sqlite3/sqlite3.go b/sqlite3/sqlite3.go
index 8c3e3d1a..c4ef6d93 100644
--- a/sqlite3/sqlite3.go
+++ b/sqlite3/sqlite3.go
@@ -26,6 +26,7 @@ type Storage struct {
 
 // ErrNotFound means that a get call did not find the requested key.
 var ErrNotFound = errors.New("key not found")
+var ErrKeyNotExist = ErrNotFound
 
 var (
 	dropQuery = `DROP TABLE IF EXISTS %s;`