diff --git a/public/app/core/components/AppChrome/TopBar/SignInLink.tsx b/public/app/core/components/AppChrome/TopBar/SignInLink.tsx
index 8b7650fd738..19791612093 100644
--- a/public/app/core/components/AppChrome/TopBar/SignInLink.tsx
+++ b/public/app/core/components/AppChrome/TopBar/SignInLink.tsx
@@ -8,7 +8,12 @@ import { useStyles2 } from '@grafana/ui';
 export function SignInLink() {
   const location = useLocation();
   const styles = useStyles2(getStyles);
-  const loginUrl = textUtil.sanitizeUrl(locationUtil.getUrlForPartial(location, { forceLogin: 'true' }));
+  let loginUrl = textUtil.sanitizeUrl(locationUtil.getUrlForPartial(location, { forceLogin: 'true' }));
+
+  // Fix for loginUrl starting with "//" which is a scheme relative URL
+  if (loginUrl.startsWith('//')) {
+    loginUrl = loginUrl.replace(/\/+/g, '/');
+  }
 
   return (
     <a className={styles.link} href={loginUrl} target="_self">