diff --git a/lib/components/src/blocks/Source.tsx b/lib/components/src/blocks/Source.tsx
index 831f8057748e..582801087ed6 100644
--- a/lib/components/src/blocks/Source.tsx
+++ b/lib/components/src/blocks/Source.tsx
@@ -69,7 +69,4 @@ const Source: FunctionComponent<SourceProps> = props => {
   return <ThemeProvider theme={convert(overrideTheme)}>{syntaxHighlighter}</ThemeProvider>;
 };
 
-Source.defaultProps = {
-  format: false,
-};
 export { Source };