diff --git a/lib/asn1/asn1_print.c b/lib/asn1/asn1_print.c
index 4251af56a..b1524a348 100644
--- a/lib/asn1/asn1_print.c
+++ b/lib/asn1/asn1_print.c
@@ -40,6 +40,7 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <getarg.h>
+#include <err.h>
 
 RCSID("$Id$");