diff --git a/cf/Makefile.am.common b/cf/Makefile.am.common
index 9c238e13c..c6a95985d 100644
--- a/cf/Makefile.am.common
+++ b/cf/Makefile.am.common
@@ -6,7 +6,7 @@ SUFFIXES = .et .h
 
 INCLUDES = -I$(top_builddir)/include
 
-AM_CFLAGS += $(WFLAGS)
+AM_CFLAGS += $(WFLAGS) $(CPPFLAGS_roken)
 
 CP	= cp