diff --git a/plugin/pkg/client/auth/azure/azure.go b/plugin/pkg/client/auth/azure/azure.go
index 60304b0f..9858963e 100644
--- a/plugin/pkg/client/auth/azure/azure.go
+++ b/plugin/pkg/client/auth/azure/azure.go
@@ -17,6 +17,7 @@ limitations under the License.
 package azure
 
 import (
+	"encoding/json"
 	"errors"
 	"fmt"
 	"net/http"
@@ -243,9 +244,9 @@ func (ts *azureTokenSource) retrieveTokenFromCfg() (*azureToken, error) {
 		token: adal.Token{
 			AccessToken:  accessToken,
 			RefreshToken: refreshToken,
-			ExpiresIn:    expiresIn,
-			ExpiresOn:    expiresOn,
-			NotBefore:    expiresOn,
+			ExpiresIn:    json.Number(expiresIn),
+			ExpiresOn:    json.Number(expiresOn),
+			NotBefore:    json.Number(expiresOn),
 			Resource:     fmt.Sprintf("spn:%s", apiserverID),
 			Type:         tokenType,
 		},
@@ -262,8 +263,8 @@ func (ts *azureTokenSource) storeTokenInCfg(token *azureToken) error {
 	newCfg[cfgClientID] = token.clientID
 	newCfg[cfgTenantID] = token.tenantID
 	newCfg[cfgApiserverID] = token.apiserverID
-	newCfg[cfgExpiresIn] = token.token.ExpiresIn
-	newCfg[cfgExpiresOn] = token.token.ExpiresOn
+	newCfg[cfgExpiresIn] = string(token.token.ExpiresIn)
+	newCfg[cfgExpiresOn] = string(token.token.ExpiresOn)
 
 	err := ts.persister.Persist(newCfg)
 	if err != nil {