diff --git a/ktor-client/ktor-client-plugins/ktor-client-auth/common/src/io/ktor/client/plugins/auth/providers/BearerAuthProvider.kt b/ktor-client/ktor-client-plugins/ktor-client-auth/common/src/io/ktor/client/plugins/auth/providers/BearerAuthProvider.kt
index eba27bdfbe2..33fb1c2c056 100644
--- a/ktor-client/ktor-client-plugins/ktor-client-auth/common/src/io/ktor/client/plugins/auth/providers/BearerAuthProvider.kt
+++ b/ktor-client/ktor-client-plugins/ktor-client-auth/common/src/io/ktor/client/plugins/auth/providers/BearerAuthProvider.kt
@@ -23,7 +23,7 @@ public fun AuthConfig.bearer(block: BearerAuthConfig.() -> Unit) {
 
 public class BearerTokens(
     public val accessToken: String,
-    public val refreshToken: String
+    public val refreshToken: String?
 )
 
 /**