Index: vala/valainterfacewriter.vala
===================================================================
--- vala/valainterfacewriter.vala	(revision 602)
+++ vala/valainterfacewriter.vala	(working copy)
@@ -123,6 +123,10 @@
 			}
 		}
 
+                if (cl.get_cname () != cl.get_default_cname ()) {
+                        write_string ("cname = \"%s\", ".printf (cl.get_cname ()));
+                }
+
 		write_string ("cheader_filename = \"%s\")]".printf (cheaders));
 		write_newline ();
 		
Index: vala/valaclass.vala
===================================================================
--- vala/valaclass.vala	(revision 602)
+++ vala/valaclass.vala	(working copy)
@@ -346,7 +346,21 @@
 		}
 		return cname;
 	}
-	
+
+        /**
+	 * Returns the default interface name of this class as it is used in C
+	 * code.
+	 *
+	 * @return the name to be used in C code by default
+	 */
+	public virtual string! get_default_cname () {
+	        if (name.has_prefix ("_")) {
+	                return "_%s%s".printf (parent_symbol.get_cprefix (), name.offset (1));
+	        } else {
+	                return "%s%s".printf (parent_symbol.get_cprefix (), name);
+	        }
+	}
+
 	/**
 	 * Sets the name of this class as it is used in C code.
 	 *