diff --git a/lib/asn1/Makefile.am b/lib/asn1/Makefile.am
index 67a8cbe01..ac1e4e9ee 100644
--- a/lib/asn1/Makefile.am
+++ b/lib/asn1/Makefile.am
@@ -2,7 +2,7 @@
 
 AUTOMAKE_OPTIONS = no-dependencies foreign
 
-WFLAGS=@WFLAGS@
+WFLAGS=@WFLAGS@ @WFLAGS_NOUNUSED@
 CFLAGS=$(WFLAGS) @CFLAGS@
 
 YFLAGS = -d