diff --git a/src/devOpt/devXxSr620Gpib.c b/src/devOpt/devXxSr620Gpib.c
index a811d1970..6a602a480 100644
--- a/src/devOpt/devXxSr620Gpib.c
+++ b/src/devOpt/devXxSr620Gpib.c
@@ -42,8 +42,8 @@
 #define	DSET_LO		devLoSr620Gpib
 #define	DSET_BI		devBiSr620Gpib
 #define	DSET_BO		devBoSr620Gpib
-#define	DSET_MBBO	devMbbiSr620Gpib
-#define	DSET_MBBI	devMbboSr620Gpib
+#define	DSET_MBBO	devMbboSr620Gpib
+#define	DSET_MBBI	devMbbiSr620Gpib
 #define	DSET_SI		devSiSr620Gpib
 #define	DSET_SO		devSoSr620Gpib
 
diff --git a/src/vxWorks/devOpt/devXxSr620Gpib.c b/src/vxWorks/devOpt/devXxSr620Gpib.c
index a811d1970..6a602a480 100644
--- a/src/vxWorks/devOpt/devXxSr620Gpib.c
+++ b/src/vxWorks/devOpt/devXxSr620Gpib.c
@@ -42,8 +42,8 @@
 #define	DSET_LO		devLoSr620Gpib
 #define	DSET_BI		devBiSr620Gpib
 #define	DSET_BO		devBoSr620Gpib
-#define	DSET_MBBO	devMbbiSr620Gpib
-#define	DSET_MBBI	devMbboSr620Gpib
+#define	DSET_MBBO	devMbboSr620Gpib
+#define	DSET_MBBI	devMbbiSr620Gpib
 #define	DSET_SI		devSiSr620Gpib
 #define	DSET_SO		devSoSr620Gpib