diff --git a/CHANGELOG.md b/CHANGELOG.md
index 15bed5d92..69386b4c3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Ensure custom variants using `@scope` wrap the generated utilities instead of nesting inside them ([#20369](https://github.com/tailwindlabs/tailwindcss/pull/20369))
 - Fix flattening of `@scope` at-rules ([#20369](https://github.com/tailwindlabs/tailwindcss/pull/20369))
 - Fix standalone declarations in `@scope`, wrap them in `:where(:scope)` ([#20369](https://github.com/tailwindlabs/tailwindcss/pull/20369))
+- Always emit a space for empty fallback values in CSS variables (e.g. `var(--tw-blur,)` → `var(--tw-blur, )`) ([#20373](https://github.com/tailwindlabs/tailwindcss/pull/20373))
 
 ## [4.3.3] - 2026-07-16