diff --git a/modules/primer-base/lib/base.scss b/modules/primer-base/lib/base.scss
index 88213a74..bb634fe8 100644
--- a/modules/primer-base/lib/base.scss
+++ b/modules/primer-base/lib/base.scss
@@ -64,4 +64,6 @@ th {
 
 button {
   cursor: pointer;
+  // Remove border radius added by Chroma macOS
+  border-radius: 0;
 }