diff --git a/swig/idd.i b/swig/idd.i
index 203657c..5fc0c11 100644
--- a/swig/idd.i
+++ b/swig/idd.i
@@ -1,6 +1,6 @@
 %ignore debugger_t;
 
-%apply unsigned char (char dtyp);
+%apply unsigned char { char dtyp };
 
 %include "idd.hpp"