diff --git a/content/fetchers/data.c b/content/fetchers/data.c
index d41c4e8d9..8e6305dd9 100644
--- a/content/fetchers/data.c
+++ b/content/fetchers/data.c
@@ -23,6 +23,7 @@
 
 #include <stdbool.h>
 #include <string.h>
+#include <stdarg.h>
 #include <stdlib.h>
 #include <libwapcaplet/libwapcaplet.h>
 #include <nsutils/base64.h>