diff --git a/acsMotionApp/src/Makefile b/acsMotionApp/src/Makefile
index e11bec6..278d38e 100644
--- a/acsMotionApp/src/Makefile
+++ b/acsMotionApp/src/Makefile
@@ -8,7 +8,8 @@ include $(TOP)/configure/CONFIG
 
 DBD += AcsMotionSupport.dbd
 
-LIBRARY_IOC = AcsMotion
+LIBRARY_IOC_DEFAULT = AcsMotion
+LIBRARY_IOC_vxWorks = -nil-
 
 SRCS += SPiiPlusBinComm.cpp
 SRCS += SPiiPlusCommDriver.cpp