diff --git a/motorApp/NewportSrc/Makefile.Vx b/motorApp/NewportSrc/Makefile.Vx
index 7526c07d..d5bcf9f0 100644
--- a/motorApp/NewportSrc/Makefile.Vx
+++ b/motorApp/NewportSrc/Makefile.Vx
@@ -12,14 +12,17 @@ include $(TOP)/config/CONFIG_APP
 
 # The following is required for the Newport MM3000 (i.e., MM3000) device driver.
 SRCS.c += ../devMM3000.c ../drvMM3000.c
-LIBOBJS += devMM3000.o drvMM3000.o
 INSTALLS += devMM3000.o drvMM3000.o
 
 # The following is required for the Newport MM4000/5 (i.e., MM4000) device driver.
 SRCS.c += ../devMM4000.c ../drvMM4000.c
-LIBOBJS += devMM4000.o drvMM4000.o
 INSTALLS += devMM4000.o drvMM4000.o
 
+# The following is required for the Newport PM500 device driver.
+SRCS.c += ../devPM500.c ../drvPM500.c
+INSTALLS += devPM500.o drvPM500.o
+
+LIBOBJS = $(SRCS.c:../%.c=%.o)
 LIBNAME = newportLib
 
 #Note that the command line that builds the