diff --git a/lib/share.c b/lib/share.c
index 8e5ec0ea04..cd555a88fb 100644
--- a/lib/share.c
+++ b/lib/share.c
@@ -22,6 +22,7 @@
  ***************************************************************************/
 
 #include "setup.h"
+#include <stdarg.h>
 #include <stdlib.h>
 #include <curl/curl.h>
 #include "urldata.h"