diff --git a/charts/ceph-csi-rbd/templates/provisioner-deployment.yaml b/charts/ceph-csi-rbd/templates/provisioner-deployment.yaml
index 885db29b3..191500d5b 100644
--- a/charts/ceph-csi-rbd/templates/provisioner-deployment.yaml
+++ b/charts/ceph-csi-rbd/templates/provisioner-deployment.yaml
@@ -52,6 +52,7 @@ spec:
             - "--timeout={{ .Values.provisioner.timeout }}"
             - "--leader-election=true"
             - "--retry-interval-start=500ms"
+            - "--default-fstype={{ .Values.provisioner.defaultFSType }}"
 {{- if .Values.topology.enabled }}
             - "--feature-gates=Topology=true"
 {{- end }}
diff --git a/charts/ceph-csi-rbd/values.yaml b/charts/ceph-csi-rbd/values.yaml
index 907b77fc3..6125f38ed 100644
--- a/charts/ceph-csi-rbd/values.yaml
+++ b/charts/ceph-csi-rbd/values.yaml
@@ -110,6 +110,8 @@ nodeplugin:
 provisioner:
   name: provisioner
   replicaCount: 3
+  # if fstype is not specified in storageclass, ext4 is default
+  defaultFSType: ext4
   # deployController to enable or disable the deployment of controller which
   # generates the OMAP data if its not Present.
   deployController: true
diff --git a/deploy/rbd/kubernetes/csi-rbdplugin-provisioner.yaml b/deploy/rbd/kubernetes/csi-rbdplugin-provisioner.yaml
index 103bf92f7..cd223bbaf 100644
--- a/deploy/rbd/kubernetes/csi-rbdplugin-provisioner.yaml
+++ b/deploy/rbd/kubernetes/csi-rbdplugin-provisioner.yaml
@@ -51,6 +51,8 @@ spec:
             - "--leader-election=true"
             #  set it to true to use topology based provisioning
             - "--feature-gates=Topology=false"
+            # if fstype is not specified in storageclass, ext4 is default
+            - "--default-fstype=ext4"
           env:
             - name: ADDRESS
               value: unix:///csi/csi-provisioner.sock