diff --git a/index.js b/index.js
index 5582651..9bc9897 100644
--- a/index.js
+++ b/index.js
@@ -7,7 +7,7 @@
 
 var isExtglob = require('is-extglob');
 var chars = { '{': '}', '(': ')', '[': ']'};
-var strictRegex = /\\(.)|(^!|\*|[\].+)]\?|\[[^\\\]]+\]|\{[^\\}]+\}|\(\?[:!=][^\\)]+\)|\([^|]+\|[^\\)]+\))/;
+var strictRegex = /\\(.)|(^!|\*|\?|[\].+)]\?|\[[^\\\]]+\]|\{[^\\}]+\}|\(\?[:!=][^\\)]+\)|\([^|]+\|[^\\)]+\))/;
 var relaxedRegex = /\\(.)|(^!|[*?{}()[\]]|\(\?)/;
 
 module.exports = function isGlob(str, options) {
diff --git a/test.js b/test.js
index 4fcae29..6654407 100644
--- a/test.js
+++ b/test.js
@@ -19,6 +19,10 @@ describe('isGlob', function() {
       assert(isGlob('!*.js'));
       assert(isGlob('!foo'));
       assert(isGlob('!foo.js'));
+      assert(isGlob('foo?'));
+      assert(isGlob('foo?.js'));
+      assert(isGlob('bar?/foo.js'));
+      assert(isGlob('bar?/foo?.js'));
       assert(isGlob('**/abc.js'));
       assert(isGlob('abc/*.js'));
       assert(isGlob('@.(?:abc)'));