diff --git a/packages/plugin-bibtex/src/mapping/shared.js b/packages/plugin-bibtex/src/mapping/shared.js
index <HASH>..<HASH> 100644
--- a/packages/plugin-bibtex/src/mapping/shared.js
+++ b/packages/plugin-bibtex/src/mapping/shared.js
@@ -152,7 +152,7 @@ export function parseMonth (value) {
     return []
   }
 
-  if (parseInt(value, 10)) {
+  if (+value) {
     return [parseInt(value, 10)]
   }
fix(plugin-bibtex): do not ignore month after day

Do not ignore month names after days in month fields.