diff --git a/src/include/ngspice/tskdefs.h b/src/include/ngspice/tskdefs.h
index 9d59bd4b4..3593b68e3 100644
--- a/src/include/ngspice/tskdefs.h
+++ b/src/include/ngspice/tskdefs.h
@@ -31,6 +31,9 @@ struct TSKtask {
 #define DOING_TRAN 8
 #ifdef RFSPICE
 #define DOING_SP   16
+#endif
+#ifdef WITH_HB
+#define DOING_HB   32;
 #endif
 
     int TSKbypass;