diff --git a/src/org.ts b/src/org.ts
index e48f8fbc82..791911845e 100644
--- a/src/org.ts
+++ b/src/org.ts
@@ -379,7 +379,7 @@ export class Org extends AsyncCreatable<Org.Options> {
    * @param {value} The value to save
    */
   public async setSandboxOrgConfigField(field: SandboxOrgConfig.Fields, value: string): Promise<Org> {
-    const sandboxOrgConfig: SandboxOrgConfig = await this.retrieveSandboxOrgConfig();
+    const sandboxOrgConfig = await this.retrieveSandboxOrgConfig();
     sandboxOrgConfig.set(field, value);
     await sandboxOrgConfig.write();
     return this;
@@ -449,25 +449,6 @@ export class Org extends AsyncCreatable<Org.Options> {
     return this.connection;
   }
 
-  /**
-   * Returns a promise to delete an auth info file from the local file system and any related cache information for
-   * this Org.. You don't want to call this method directly. Instead consider calling Org.remove()
-   */
-  public async removeAuth(): Promise<void> {
-    const username = ensure(this.getUsername());
-    this.logger.debug(`Removing auth for user: ${username}`);
-    const config = await AuthInfoConfig.create({
-      ...AuthInfoConfig.getOptions(username),
-      throwOnNotFound: false
-    });
-
-    this.logger.debug(`Clearing auth cache for user: ${username}`);
-    AuthInfo.clearCache(username);
-    if (await config.exists()) {
-      await config.unlink();
-    }
-  }
-
   /**
    * Initialize async components.
    */
@@ -504,6 +485,25 @@ export class Org extends AsyncCreatable<Org.Options> {
     throw new SfdxError('Not Supported');
   }
 
+  /**
+   * Returns a promise to delete an auth info file from the local file system and any related cache information for
+   * this Org.. You don't want to call this method directly. Instead consider calling Org.remove()
+   */
+  private async removeAuth(): Promise<void> {
+    const username = ensure(this.getUsername());
+    this.logger.debug(`Removing auth for user: ${username}`);
+    const config = await AuthInfoConfig.create({
+      ...AuthInfoConfig.getOptions(username),
+      throwOnNotFound: false
+    });
+
+    this.logger.debug(`Clearing auth cache for user: ${username}`);
+    AuthInfo.clearCache(username);
+    if (await config.exists()) {
+      await config.unlink();
+    }
+  }
+
   /**
    * Deletes the users config file
    */
diff --git a/test/unit/orgTest.ts b/test/unit/orgTest.ts
index 13875f366a..b484aab00d 100644
--- a/test/unit/orgTest.ts
+++ b/test/unit/orgTest.ts
@@ -729,6 +729,15 @@ describe('Org Tests', () => {
 
   describe('sandbox org config', () => {
     it('set field', async () => {
+      const org: Org = await Org.create({ aliasOrUsername: testData.username });
+      expect(await org.getSandboxOrgConfigField(SandboxOrgConfig.Fields.PROD_ORG_USERNAME)).to.be.undefined;
+
+      await org.setSandboxOrgConfigField(SandboxOrgConfig.Fields.PROD_ORG_USERNAME, 'user@sandbox.org');
+
+      expect(await org.getSandboxOrgConfigField(SandboxOrgConfig.Fields.PROD_ORG_USERNAME)).to.eq('user@sandbox.org');
+    });
+
+    it('Test sandbox config removal.', async () => {
       // Stub exists so only the auth file and sandbox config file exist. No users config file.
       stubMethod($$.SANDBOX, ConfigFile.prototype, 'exists').callsFake(async function() {
         if (this.path && this.path.endsWith(`${testData.orgId}.json`)) {