diff --git a/src/include/ngspice/cktdefs.h b/src/include/ngspice/cktdefs.h
index 69c9c7cdf..d9b4ec6c7 100644
--- a/src/include/ngspice/cktdefs.h
+++ b/src/include/ngspice/cktdefs.h
@@ -477,6 +477,7 @@ extern int CKTspCalcSMatrix(CKTcircuit* ckt);
 extern int HBan(CKTcircuit*, int);
 extern int HBaskQuest(CKTcircuit*, JOB*, int, IFvalue*);
 extern int HBsetParm(CKTcircuit*, JOB*, int, IFvalue*);
+extern int HBgetOptions(void);
 #endif
 
 #ifdef __cplusplus