diff --git a/lib/core.js b/lib/core.js
index 74362f78..3601df5a 100644
--- a/lib/core.js
+++ b/lib/core.js
@@ -89,7 +89,7 @@ core.getProblem = function(keyword, cb) {
 
     keyword = Number(keyword) || keyword;
     const problem = problems.find(function(x) {
-      return x.fid === keyword || x.name === keyword || x.slug === keyword;
+      return x.fid === keyword || +x.fid === +keyword || x.name === keyword || x.slug === keyword;
     });
     if (!problem) return cb('Problem not found!');
     core.next.getProblem(problem, cb);