diff --git a/packages/babel-standalone/test/babel.js b/packages/babel-standalone/test/babel.js
index 8af895cc4149..8589d1f83a7a 100644
--- a/packages/babel-standalone/test/babel.js
+++ b/packages/babel-standalone/test/babel.js
@@ -256,6 +256,9 @@ const require = createRequire(import.meta.url);
           }),
         ).not.toThrow();
       });
+      it("#14425 - numeric separators should be parsed correctly", () => {
+        expect(() => Babel.transform("1_1", {})).not.toThrow();
+      });
     });
   },
 );