diff --git a/UNRELEASED.md b/UNRELEASED.md
index a54ef68b532..20eba85708d 100644
--- a/UNRELEASED.md
+++ b/UNRELEASED.md
@@ -18,6 +18,7 @@ Use [the changelog guidelines](https://git.io/polaris-changelog-guidelines) to f
 - Fixed vertical alignment of Tabs disclosure activator ([#2087](https://github.com/Shopify/polaris-react/pull/2087))
 - Fixed `Modal` setting an invalid `id` on `aria-labelledby` when no `title` is set ([#2115](https://github.com/Shopify/polaris-react/pull/2115))
 - Fixed error warnings in `Card` and `RollupActions` tests ([#2125](https://github.com/Shopify/polaris-react/pull/2125))
+- Fixed modal border not being visible in Windows high contrast mode ([#2114](https://github.com/Shopify/polaris-react/pull/2114))
 - Added default accessibility label from `ResourceItem` ([#2097](https://github.com/Shopify/polaris-react/pull/2097))
 
 ### Documentation
diff --git a/src/components/Modal/components/Dialog/Dialog.scss b/src/components/Modal/components/Dialog/Dialog.scss
index 644c105517a..0020f7173b3 100644
--- a/src/components/Modal/components/Dialog/Dialog.scss
+++ b/src/components/Modal/components/Dialog/Dialog.scss
@@ -35,6 +35,10 @@ $large-width: rem(980px);
   background: color('white');
   box-shadow: shadow(layer);
 
+  @media (-ms-high-contrast: active) {
+    border: 1px solid ms-high-contrast-color('text');
+  }
+
   @include frame-when-nav-hidden {
     bottom: 0;
     max-height: 100%;