diff --git a/src/cas/build/singleThread/Makefile.Unix b/src/cas/build/singleThread/Makefile.Unix
index d801cba8f..0dc63a703 100644
--- a/src/cas/build/singleThread/Makefile.Unix
+++ b/src/cas/build/singleThread/Makefile.Unix
@@ -9,6 +9,8 @@ VPATH = $(SRC) $(IOSRC) $(OSSRC)
 
 include $(TOP)/config/CONFIG_BASE
 
+CXXCMPLR = STRICT
+
 USR_INCLUDES = -I$(SRC) -I$(OSSRC) -I$(IOSRC) -I$(CA)
 
 DEPLIBS_BASE = $(EPICS_BASE_LIB)
diff --git a/src/cas/example/Makefile.Unix b/src/cas/example/Makefile.Unix
index 5b3412318..882885390 100644
--- a/src/cas/example/Makefile.Unix
+++ b/src/cas/example/Makefile.Unix
@@ -4,6 +4,8 @@ TOP = $(CAS)/../..
 
 include $(TOP)/config/CONFIG_BASE
 
+CXXCMPLR = STRICT
+
 USR_INCLUDES = 
 USR_LDLIBS = -lcas -lca -lCom -lgdd