diff --git a/guile/mu-guile-message.hh b/guile/mu-guile-message.hh
index 066d8079..04a5c789 100644
--- a/guile/mu-guile-message.hh
+++ b/guile/mu-guile-message.hh
@@ -27,6 +27,6 @@
  *
  * @return
  */
-void* mu_guile_message_init (void *data);
+extern "C" { void* mu_guile_message_init (void *data);}
 
 #endif /*MU_GUILE_MESSAGE_HH__*/
diff --git a/guile/mu-guile.hh b/guile/mu-guile.hh
index d2b72ef3..34d9398d 100644
--- a/guile/mu-guile.hh
+++ b/guile/mu-guile.hh
@@ -82,6 +82,5 @@ SCM mu_guile_scm_from_str (const char *str);
  *
  * @return
  */
-void* mu_guile_init (void *data);
-
+extern "C" { void* mu_guile_init (void *data); }
 #endif /*__MU_GUILE_H__*/