diff --git a/swig/ua.i b/swig/ua.i
index 3347881..1ae9cd1 100644
--- a/swig/ua.i
+++ b/swig/ua.i
@@ -1,6 +1,15 @@
+%apply unsigned char { char n };
+%apply unsigned char { char offb };
+%apply unsigned char { char offo };
+%apply unsigned char { char dtyp };
 
 %include "ua.hpp"
 
+%clear (char n);
+%clear (char offb);
+%clear (char offo);
+%clear (char dtyp);
+
 // Small function to get the global cmd pointer
 // In Python it returns an insn_t class instance
 %inline {