diff --git a/store.go b/store.go
index 7751912..3dbf59d 100644
--- a/store.go
+++ b/store.go
@@ -48,6 +48,8 @@ type Store struct {
 	purgeWaitGroup sync.WaitGroup
 	purgeInterval  time.Duration // interval between background purge cycles
 	journal        journalConfig
+	closeLock      sync.Mutex
+	closed         bool
 
 	// Event dispatch state.
 	watchers                   map[string][]chan Event
@@ -109,6 +111,14 @@ func New(databasePath string, options ...StoreOption) (*Store, error) {
 
 // Usage example: `storeInstance, err := store.New(":memory:"); if err != nil { return }; defer storeInstance.Close()`
 func (storeInstance *Store) Close() error {
+	storeInstance.closeLock.Lock()
+	if storeInstance.closed {
+		storeInstance.closeLock.Unlock()
+		return nil
+	}
+	storeInstance.closed = true
+	storeInstance.closeLock.Unlock()
+
 	storeInstance.cancelPurge()
 	storeInstance.purgeWaitGroup.Wait()
 	if err := storeInstance.database.Close(); err != nil {
diff --git a/store_test.go b/store_test.go
index 5d2a42b..88c48c7 100644
--- a/store_test.go
+++ b/store_test.go
@@ -655,6 +655,13 @@ func TestStore_Close_Good(t *testing.T) {
 	require.NoError(t, err)
 }
 
+func TestStore_Close_Good_Idempotent(t *testing.T) {
+	storeInstance, _ := New(":memory:")
+
+	require.NoError(t, storeInstance.Close())
+	require.NoError(t, storeInstance.Close())
+}
+
 func TestStore_Close_Good_OperationsFailAfterClose(t *testing.T) {
 	storeInstance, _ := New(":memory:")
 	require.NoError(t, storeInstance.Close())