diff --git a/packages/react-dom/src/shared/CSSProperty.js b/packages/react-dom/src/shared/CSSProperty.js
index 7b1e4aba8b545..446965fc182ee 100644
--- a/packages/react-dom/src/shared/CSSProperty.js
+++ b/packages/react-dom/src/shared/CSSProperty.js
@@ -10,6 +10,7 @@
  */
 export const isUnitlessNumber = {
   animationIterationCount: true,
+  aspectRatio: true,
   borderImageOutset: true,
   borderImageSlice: true,
   borderImageWidth: true,