diff --git a/lib/extract/extractText.js b/lib/extract/extractText.js
index 4aa631a8..8b0433f7 100644
--- a/lib/extract/extractText.js
+++ b/lib/extract/extractText.js
@@ -70,7 +70,7 @@ export function extractFont(prop) {
         fontVariant,
         fontWeight,
         fontStretch,
-        fontSize: fontSize ? String(fontSize) : null,
+        fontSize,
         fontFamily: extractSingleFontFamily(fontFamily),
         textAnchor,
         textDecoration,