diff --git a/src/cas/build/singleThread/Makefile.Host b/src/cas/build/singleThread/Makefile.Host
index 3bec7f8ad..b7d23ad9e 100644
--- a/src/cas/build/singleThread/Makefile.Host
+++ b/src/cas/build/singleThread/Makefile.Host
@@ -37,6 +37,7 @@ LIBSRCS += casAsyncExIOI.cc
 LIBSRCS += casEventSys.cc
 LIBSRCS += casMonitor.cc
 LIBSRCS += casMonEvent.cc
+LIBSRCS += casOpaqueAddr.cc
 LIBSRCS += inBuf.o 
 LIBSRCS += outBuf.cc
 LIBSRCS += dgInBuf.o 
diff --git a/src/cas/build/singleThread/Makefile.Unix b/src/cas/build/singleThread/Makefile.Unix
index 92c0dcff5..7ec8675fc 100644
--- a/src/cas/build/singleThread/Makefile.Unix
+++ b/src/cas/build/singleThread/Makefile.Unix
@@ -40,6 +40,7 @@ SRCS.cc += casAsyncExIOI.cc
 SRCS.cc += casEventSys.cc 
 SRCS.cc += casMonitor.cc 
 SRCS.cc += casMonEvent.cc 
+SRCS.cc += casOpaqueAddr.cc 
 SRCS.cc += inBuf.cc 
 SRCS.cc += outBuf.cc 
 SRCS.cc += dgInBuf.cc 
@@ -85,6 +86,7 @@ LIBOBJS += casAsyncExIOI.o
 LIBOBJS += casEventSys.o
 LIBOBJS += casMonitor.o
 LIBOBJS += casMonEvent.o
+LIBOBJS += casOpaqueAddr.o
 LIBOBJS += inBuf.o 
 LIBOBJS += outBuf.o
 LIBOBJS += dgInBuf.o