diff --git a/swig/constants.i b/swig/constants.i
index 1efca59..091bd9a 100644
--- a/swig/constants.i
+++ b/swig/constants.i
@@ -32,5 +32,6 @@
   const std::string major_version();
   const std::string api_version();
   const std::string minor_version();
+  const std::string maint_version();
  } /* namespace gsm */
 } /* namespace gr */