diff --git a/internal/api/oidc/client.go b/internal/api/oidc/client.go
index a7f0e9b67e..2654e68323 100644
--- a/internal/api/oidc/client.go
+++ b/internal/api/oidc/client.go
@@ -541,7 +541,7 @@ func (o *OPStorage) privateClaimsFlows(ctx context.Context, userID string, claim
 				actions.SetFields("claims",
 					actions.SetFields("setClaim", func(key string, value interface{}) {
 						if _, ok := claims[key]; !ok {
-							claims[key] = value
+							claims = appendClaim(claims, key, value)
 							return
 						}
 						claimLogs = append(claimLogs, fmt.Sprintf("key %q already exists", key))