diff --git a/Source/Modules1.1/guile.h b/Source/Modules1.1/guile.h
index 9b964fe6e..3157507a3 100644
--- a/Source/Modules1.1/guile.h
+++ b/Source/Modules1.1/guile.h
@@ -30,6 +30,7 @@ private:
   char   *prefix;
   char   *module;
   char   *package;
+  int    linkage;
   void   get_pointer(char *iname, int parm, DataType *t, WrapperFunction &f);
   void   usage_var(char *, DataType *, String &usage);
   void   usage_func(char *, DataType *, ParmList *, String &usage);