diff --git a/func.cc b/func.cc
index 876b274..e313c9e 100644
--- a/func.cc
+++ b/func.cc
@@ -583,7 +583,7 @@
     Intern("5"), Intern("6"),  Intern("7"), Intern("8"), Intern("9")
   };
 
-  const string&& func_name = args[0]->Eval(ev);
+  const string&& func_name = TrimSpace(args[0]->Eval(ev)).as_string();
   Var* func = ev->LookupVar(Intern(func_name));
   if (!func->IsDefined()) {
     KATI_WARN("%s:%d: *warning*: undefined user function: %s",