diff --git a/isisd/Makefile.am b/isisd/Makefile.am
index dba681b..4e67b22 100644
--- a/isisd/Makefile.am
+++ b/isisd/Makefile.am
@@ -6,7 +6,7 @@
 INSTALL_SDATA=@INSTALL@ -m 600
 LIBS = @LIBS@ 
 
-AM_CFLAGS = $(PICFLAGS)
+AM_CFLAGS = $(PICFLAGS) $(WERROR)
 AM_LDFLAGS = $(PILDFLAGS)
 
 noinst_LIBRARIES = libisis.a