diff --git a/lib/atf/libatf-c++/Makefile b/lib/atf/libatf-c++/Makefile
index 03e7d19c4440..c865e6685f1e 100644
--- a/lib/atf/libatf-c++/Makefile
+++ b/lib/atf/libatf-c++/Makefile
@@ -48,6 +48,9 @@ CFLAGS+=	-I.
 
 CFLAGS+=	-DHAVE_CONFIG_H
 
+# Silence warnings about std::auto_ptr usage
+CWARNFLAGS+=	-Wno-deprecated-declarations
+
 SRCS=		application.cpp \
 		build.cpp \
 		check.cpp \
diff --git a/libexec/atf/atf-check/Makefile b/libexec/atf/atf-check/Makefile
index 4fe6e4e7dbb9..90f6e2a3a0a0 100644
--- a/libexec/atf/atf-check/Makefile
+++ b/libexec/atf/atf-check/Makefile
@@ -38,6 +38,9 @@ MAN=		atf-check.1
 CFLAGS+=	-I${ATF}
 CFLAGS+=	-DATF_SHELL='"/bin/sh"'
 
+# Silence warnings about std::auto_ptr usage
+CWARNFLAGS+=	-Wno-deprecated-declarations
+
 LIBADD=		atf_cxx
 
 HAS_TESTS=
diff --git a/libexec/atf/atf-sh/Makefile b/libexec/atf/atf-sh/Makefile
index dd8cfaf1775d..8ac0484e3c06 100644
--- a/libexec/atf/atf-sh/Makefile
+++ b/libexec/atf/atf-sh/Makefile
@@ -65,6 +65,9 @@ CFLAGS+=	-DATF_PKGDATADIR='"${SHAREDIR}/atf"'
 CFLAGS+=	-DATF_SHELL='"/bin/sh"'
 CFLAGS+=	-I${ATF}
 
+# Silence warnings about std::auto_ptr usage
+CWARNFLAGS+=	-Wno-deprecated-declarations
+
 LIBADD=		atf_cxx
 
 FILESGROUPS=	SUBR
diff --git a/share/mk/atf.test.mk b/share/mk/atf.test.mk
index 28470f2e080d..692b911eecf5 100644
--- a/share/mk/atf.test.mk
+++ b/share/mk/atf.test.mk
@@ -55,6 +55,8 @@ LDADD.${_T}+= ${LIBATF_CXX} ${LIBATF_C}
 .endif
 TEST_INTERFACE.${_T}= atf
 .endfor
+# Silence warnings about std::auto_ptr usage
+CWARNFLAGS+= -Wno-deprecated-declarations
 .endif
 
 .if !empty(ATF_TESTS_SH)