diff --git a/hscript/Interp.hx b/hscript/Interp.hx
index 4468257..a9dc5fe 100644
--- a/hscript/Interp.hx
+++ b/hscript/Interp.hx
@@ -404,7 +404,7 @@ class Interp {
 					if( args.length < minParams ) {
 						var str = "Invalid number of parameters. Got " + args.length + ", required " + minParams;
 						if( name != null ) str += " for function '" + name+"'";
-						throw str;
+						error(ECustom(str));
 					}
 					// make sure mandatory args are forced
 					var args2 = [];