Index: rocdigs/impl/dcc232.c
--- rocdigs/impl/dcc232.c.orig
+++ rocdigs/impl/dcc232.c
@@ -765,7 +765,7 @@ static int __getcvbyte(iODCC232 inst, int cv) {
    /* no special error handling, it's job of the clients */
    if (cv<0 || cv>1024) {
      TraceOp.trc( name, TRCLEVEL_EXCEPTION, __LINE__, 9999, "PT: CV[%d] out of range", cv);
-     return;
+     return 0;
    }
 
    TraceOp.trc( name, TRCLEVEL_MONITOR, __LINE__, 9999, "PT: enable booster output");