1 files changed, 1 insertions, 0 deletions

diff --git a/mac.c b/mac.c
index edf9b69b..e5d5bfa8 100644
--- a/mac.c
+++ b/mac.c
@@ -29,6 +29,7 @@
 
 #include <openssl/hmac.h>
 
+#include <stdarg.h>
 #include <string.h>
 #include <signal.h>