diff --git a/src/lib/radio/radio.scss b/src/lib/radio/radio.scss
index a665dd4be57..b8f60ac2941 100644
--- a/src/lib/radio/radio.scss
+++ b/src/lib/radio/radio.scss
@@ -181,3 +181,9 @@ $mat-radio-ripple-radius: 20px;
   bottom: 0;
   left: 50%;
 }
+
+@include cdk-high-contrast {
+  .mat-radio-disabled {
+    opacity: 0.5;
+  }
+}