diff --git a/zebra/Makefile.am b/zebra/Makefile.am
index 4808791..7dcbd66 100644
--- a/zebra/Makefile.am
+++ b/zebra/Makefile.am
@@ -20,7 +20,7 @@
 othersrc = zebra_fpm_netlink.c
 endif
 
-AM_CFLAGS = $(PICFLAGS)
+AM_CFLAGS = $(PICFLAGS) $(WERROR)
 AM_LDFLAGS = $(PILDFLAGS)
 
 sbin_PROGRAMS = zebra