diff --git a/CHANGELOG.md b/CHANGELOG.md
index cb83551e0d..51b0adfc3a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -19,6 +19,7 @@ This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.htm
 ### BREAKING CHANGES
 - Restrict Typescript checks for component props @kuzhelov ([#1290](https://github.com/stardust-ui/react/pull/1290))
 - Aligned focus styles for `Chat.Message` component with latest Teams theme design @Bugaa92 ([#1269](https://github.com/stardust-ui/react/pull/1269))
+- Fix styles for `fill` prop of `Flex` @kuzhelov ([#1352](https://github.com/stardust-ui/react/pull/1352))
 
 ### Fixes
 - Fixed `Flex.Item` children prop type @mnajdova ([#1320](https://github.com/stardust-ui/react/pull/1320))
diff --git a/packages/react/src/themes/base/components/Flex/flexStyles.ts b/packages/react/src/themes/base/components/Flex/flexStyles.ts
index 9d2adf390d..cde9351be1 100644
--- a/packages/react/src/themes/base/components/Flex/flexStyles.ts
+++ b/packages/react/src/themes/base/components/Flex/flexStyles.ts
@@ -27,6 +27,7 @@ const flexStyles: ComponentSlotStylesInput<FlexProps, FlexVariables> = {
     ...(p.wrap && { flexWrap: 'wrap' }),
 
     ...(p.fill && {
+      width: '100%',
       height: '100%',
     }),