diff --git a/src/ca/Makefile.Unix b/src/ca/Makefile.Unix
index 86b0184cf..3fc7c9bcd 100644
--- a/src/ca/Makefile.Unix
+++ b/src/ca/Makefile.Unix
@@ -1,5 +1,6 @@
 TOP = ../../..
 include $(TOP)/config/CONFIG_BASE
+CMPLR = STRICT
 
 USR_LDLIBS = -lca -lCom -lm
 USR_LDFLAGS = -L.