diff --git a/packages/core/src/components/Link/Link.test.tsx b/packages/core/src/components/Link/Link.test.tsx
index 4efd005a9e..46504e9adc 100644
--- a/packages/core/src/components/Link/Link.test.tsx
+++ b/packages/core/src/components/Link/Link.test.tsx
@@ -48,7 +48,7 @@ describe('<Link />', () => {
       [true, 'https://some-host/path#fragment'],
       [true, 'https://some-host/path?param1=value'],
       [true, 'slack://'],
-      [true, 'mailto://'],
+      [true, 'mailto:foo@example.org'],
       [true, 'ms-help://'],
       [true, 'ms.help://'],
       [true, 'ms+help://'],
@@ -56,7 +56,6 @@ describe('<Link />', () => {
       [false, '123://'],
       [false, 'abc&xzy://'],
       [false, 'http'],
-      [false, 'https:/a'],
       [false, 'path/to'],
       [false, 'path/to/something#fragment'],
       [false, 'path/to/something?param1=value'],
diff --git a/packages/core/src/components/Link/Link.tsx b/packages/core/src/components/Link/Link.tsx
index 786d36fe44..31800ddaf1 100644
--- a/packages/core/src/components/Link/Link.tsx
+++ b/packages/core/src/components/Link/Link.tsx
@@ -24,7 +24,7 @@ import {
   LinkProps as RouterLinkProps,
 } from 'react-router-dom';
 
-export const isExternalUri = (uri: string) => /^([a-z+.-]+):\/\//.test(uri);
+export const isExternalUri = (uri: string) => /^([a-z+.-]+):/.test(uri);
 
 export type LinkProps = MaterialLinkProps &
   RouterLinkProps & {