diff --git a/.changeset/fuzzy-walls-tap.md b/.changeset/fuzzy-walls-tap.md
new file mode 100644
index 00000000000..a8597afee78
--- /dev/null
+++ b/.changeset/fuzzy-walls-tap.md
@@ -0,0 +1,5 @@
+---
+"@primer/react": patch
+---
+
+Update CSS Custom Property used in skeletons to fix animation behind feature flag.
diff --git a/packages/react/src/experimental/Skeleton/SkeletonBox.module.css b/packages/react/src/experimental/Skeleton/SkeletonBox.module.css
index da8ea19c5d6..c7ce94eb732 100644
--- a/packages/react/src/experimental/Skeleton/SkeletonBox.module.css
+++ b/packages/react/src/experimental/Skeleton/SkeletonBox.module.css
@@ -19,7 +19,7 @@
     mask-image: linear-gradient(75deg, #000 30%, rgba(0, 0, 0, 0.65) 80%);
     mask-size: 200%;
     animation: shimmer;
-    animation-duration: var(base-duration-1000);
+    animation-duration: var(--base-duration-1000);
     animation-iteration-count: infinite;
   }