diff --git a/dev-helpers/oauth2-redirect.html b/dev-helpers/oauth2-redirect.html
index f4aaa93b..72fbf81b 100644
--- a/dev-helpers/oauth2-redirect.html
+++ b/dev-helpers/oauth2-redirect.html
@@ -28,8 +28,9 @@
         isValid = qp.state === sentState
 
         if ((
-          oauth2.auth.schema.get("flow") === "accessCode"||
-          oauth2.auth.schema.get("flow") === "authorizationCode"
+          oauth2.auth.schema.get("flow") === "accessCode" ||
+          oauth2.auth.schema.get("flow") === "authorizationCode" ||
+          oauth2.auth.schema.get("flow") === "authorization_code"
         ) && !oauth2.auth.code) {
             if (!isValid) {
                 oauth2.errCb({
diff --git a/dist/oauth2-redirect.html b/dist/oauth2-redirect.html
index 5e6599a2..8565155d 100644
--- a/dist/oauth2-redirect.html
+++ b/dist/oauth2-redirect.html
@@ -31,8 +31,9 @@
         isValid = qp.state === sentState
 
         if ((
-          oauth2.auth.schema.get("flow") === "accessCode"||
-          oauth2.auth.schema.get("flow") === "authorizationCode"
+          oauth2.auth.schema.get("flow") === "accessCode" ||
+          oauth2.auth.schema.get("flow") === "authorizationCode" ||
+          oauth2.auth.schema.get("flow") === "authorization_code"
         ) && !oauth2.auth.code) {
             if (!isValid) {
                 oauth2.errCb({
diff --git a/test/unit/core/oauth2-authorize.js b/test/unit/core/oauth2-authorize.js
index ddf2feda..97dbcaaf 100644
--- a/test/unit/core/oauth2-authorize.js
+++ b/test/unit/core/oauth2-authorize.js
@@ -27,6 +27,14 @@ describe("oauth2", () => {
     authConfigs: {}
   }
 
+  let authConfig3 = {
+    auth: { schema: { get: (key)=> mockSchema[key] }, scopes: Im.List(["scope4","scope5"]) },
+    authActions: {},
+    errActions: {},
+    configs: { oauth2RedirectUrl: "" },
+    authConfigs: {}
+  }
+
   beforeEach(() => {
     win.open = jest.fn()
   })
@@ -114,5 +122,17 @@ describe("oauth2", () => {
 
       windowOpenSpy.mockReset()
     })
+
+    it("should build authorize url for authorization_code flow", () => {
+      const windowOpenSpy = jest.spyOn(win, "open")
+      mockSchema.authorizationUrl = "https://testAuthorizationUrl"
+      mockSchema.flow = "authorization_code"
+
+      oauth2Authorize(authConfig3)
+      expect(windowOpenSpy.mock.calls.length).toEqual(1)
+      expect(windowOpenSpy.mock.calls[0][0]).toMatch("https://testAuthorizationUrl?response_type=code&redirect_uri=&scope=scope4%20scope5&state=")
+
+      windowOpenSpy.mockReset()
+    })
   })
 })