diff --git a/sbin/savecore/Makefile b/sbin/savecore/Makefile
index 384af1370ec4..172df7e857bc 100644
--- a/sbin/savecore/Makefile
+++ b/sbin/savecore/Makefile
@@ -1,19 +1,21 @@
 # $FreeBSD$
 
 PACKAGE=runtime
 CONFS=	minfree
 VAR_CRASH=	/var/crash
 VAR_CRASH_MODE=	0750
 CONFSDIR=	VAR_CRASH
 PROG=	savecore
 LIBADD=	xo z
 MAN=	savecore.8
 
 .include <src.opts.mk>
 
-.if ${MK_CASPER} != "no" && !defined(RESCUE)
+.if ${MK_DYNAMICROOT} == "no"
+.warning ${PROG} built without libcasper support
+.elif ${MK_CASPER} != "no" && !defined(RESCUE)
 CFLAGS+=	-DWITH_CASPER
 LIBADD+=	casper cap_fileargs cap_syslog
 .endif
 
 .include <bsd.prog.mk>