diff --git a/lib/asn1/Makefile.am b/lib/asn1/Makefile.am
index 336bd75c1..f31d7bd46 100644
--- a/lib/asn1/Makefile.am
+++ b/lib/asn1/Makefile.am
@@ -2,7 +2,7 @@
 
 AUTOMAKE_OPTIONS = no-dependencies foreign
 
-WFLAGS=-Wall -Wno-unused -Wconversion -Wmissing-prototypes -Wredundant-decls
+WFLAGS=@WFLAGS@
 CFLAGS=$(WFLAGS) @CFLAGS@
 
 lib_LIBRARIES = libasn1.a