diff --git a/src/rustint/core.clj b/src/rustint/core.clj
index b321a14..a54d053 100644
--- a/src/rustint/core.clj
+++ b/src/rustint/core.clj
@@ -2174,7 +2174,8 @@
                 'f64 float?,
                 'String string?,
                 'bool boolean?
-                'usize usize?
+                'usize usize?,
+                'char char?
               ), func (get rtypes rtype)]
       (or (vector? arg) (func arg))
   )