diff --git a/tools/xenstore/talloc.h b/tools/xenstore/talloc.h
index a0f4bff257..518fcac151 100644
--- a/tools/xenstore/talloc.h
+++ b/tools/xenstore/talloc.h
@@ -24,6 +24,7 @@
    License along with this library; If not, see <http://www.gnu.org/licenses/>.
 */
 
+#include <stdarg.h>
 #include <sys/types.h>
 
 #include "utils.h"