diff --git a/src/components/CoreComponent/modules/stylePropTypes.js b/src/components/CoreComponent/modules/stylePropTypes.js
index 9a919862..efe1afb9 100644
--- a/src/components/CoreComponent/modules/stylePropTypes.js
+++ b/src/components/CoreComponent/modules/stylePropTypes.js
@@ -55,7 +55,7 @@ export default {
   float: string,
   font: string,
   fontFamily: string,
-  fontSize: string,
+  fontSize: numberOrString,
   fontStyle: string,
   fontWeight: string,
   height: numberOrString,