diff --git a/lib/Makefile.am b/lib/Makefile.am
index 5a80618..56837d8 100644
--- a/lib/Makefile.am
+++ b/lib/Makefile.am
@@ -1,6 +1,7 @@
 ## Process this file with automake to produce Makefile.in.
 
 AM_CPPFLAGS = -I.. -I$(top_srcdir) -I$(top_srcdir)/lib -I$(top_builddir)/lib
+AM_CFLAGS = $(WERROR)
 DEFS = @DEFS@ -DSYSCONFDIR=\"$(sysconfdir)/\"
 
 lib_LTLIBRARIES = libzebra.la