diff --git a/packages/ra-input-rich-text/src/buttons/FormatButtons.tsx b/packages/ra-input-rich-text/src/buttons/FormatButtons.tsx
index 5f13f286cd0..5c278a1c3b6 100644
--- a/packages/ra-input-rich-text/src/buttons/FormatButtons.tsx
+++ b/packages/ra-input-rich-text/src/buttons/FormatButtons.tsx
@@ -24,7 +24,7 @@ export const FormatButtons = (props: ToggleButtonGroupProps) => {
         _: 'Bold',
     });
 
-    const italicLabel = translate('ra.tiptap.Italic', {
+    const italicLabel = translate('ra.tiptap.italic', {
         _: 'Italic',
     });