diff --git a/src/ca/Makefile b/src/ca/Makefile
index 2ec5847a1..8d634b5a4 100644
--- a/src/ca/Makefile
+++ b/src/ca/Makefile
@@ -70,7 +70,7 @@ LIBSRCS += comQueSend.cpp
 LIBSRCS += comBuf.cpp
 LIBSRCS += hostNameCache.cpp
 LIBSRCS += msgForMultiplyDefinedPV.cpp
-LIBSRCS += templateInstances.cpp
+LIBSRCS_vxWorks += templateInstances.cpp
 
 LIBRARY=ca