diff --git a/apps/client/src/features/dictation/components/mic-button.module.css b/apps/client/src/features/dictation/components/mic-button.module.css
index 268335cb..53a3a2aa 100644
--- a/apps/client/src/features/dictation/components/mic-button.module.css
+++ b/apps/client/src/features/dictation/components/mic-button.module.css
@@ -6,11 +6,13 @@
 }
 
 /* Translucent red halo that sits behind the stop button and scales with the
-   live microphone level (scale set inline from audioLevel). */
+   live microphone level (scale set inline from audioLevel). Radius follows the
+   ActionIcon's own radius so the halo matches the button's rounded-square
+   outline instead of being a circle. */
 .pulse {
   position: absolute;
   inset: 0;
-  border-radius: 50%;
+  border-radius: var(--mantine-radius-default);
   background-color: var(--mantine-color-red-5);
   opacity: 0.35;
   transform-origin: center;