diff --git a/package/libeXosip2/libeXosip2.mk b/package/libeXosip2/libeXosip2.mk
index 4be2f05a9..6abdaab8a 100644
--- a/package/libeXosip2/libeXosip2.mk
+++ b/package/libeXosip2/libeXosip2.mk
@@ -12,6 +12,11 @@ LIBEXOSIP2_LICENSE_FILES = COPYING
 
 LIBEXOSIP2_DEPENDENCIES = host-pkgconf libosip2
 
+ifeq ($(BR2_arc),y)
+# toolchain __arc__ define conflicts with libeXosip2 source
+LIBEXOSIP2_CONF_ENV += CFLAGS="$(TARGET_CFLAGS) -U__arc__"
+endif
+
 ifeq ($(BR2_PACKAGE_OPENSSL),y)
 LIBEXOSIP2_DEPENDENCIES += openssl
 LIBEXOSIP2_CONF_OPT += --enable-openssl
diff --git a/package/libosip2/libosip2.mk b/package/libosip2/libosip2.mk
index 6ae8149a3..0b672d86d 100644
--- a/package/libosip2/libosip2.mk
+++ b/package/libosip2/libosip2.mk
@@ -10,6 +10,11 @@ LIBOSIP2_INSTALL_STAGING = YES
 LIBOSIP2_LICENSE = LGPLv2.1+
 LIBOSIP2_LICENSE_FILES = COPYING
 
+ifeq ($(BR2_arc),y)
+# toolchain __arc__ define conflicts with libosip2 source
+LIBOSIP2_CONF_ENV += CFLAGS="$(TARGET_CFLAGS) -U__arc__"
+endif
+
 LIBOSIP2_CONF_OPT = \
 	--enable-mt=$(if $(BR2_TOOLCHAIN_HAS_THREADS),yes,no)