diff --git a/pkg/driver/constants.go b/pkg/driver/constants.go
index c5adc3aa98..ca3bf091b8 100644
--- a/pkg/driver/constants.go
+++ b/pkg/driver/constants.go
@@ -70,7 +70,7 @@ const (
 	PVNameKey = "csi.storage.k8s.io/pv/name"
 
 	// BlockExpressKey increases the iops limit for io2 volumes to the block express limit
-	BlockExpressKey = "blockExpress"
+	BlockExpressKey = "blockexpress"
 
 	// TagKeyPrefix contains the prefix of a volume parameter that designates it as
 	// a tag to be attached to the resource