diff --git a/swig/segment.i b/swig/segment.i
index 79be4b9..5398965 100644
--- a/swig/segment.i
+++ b/swig/segment.i
@@ -27,3 +27,13 @@
 
 %include "segment.hpp"
 
+%inline %{
+  sel_t get_defsr(segment_t *s, int reg)
+  {
+    return s->defsr[reg];
+  }
+  void set_defsr(segment_t *s, int reg, sel_t value)
+  {
+    s->defsr[reg] = value;
+  }
+%}