diff --git a/xmalloc.c b/xmalloc.c
index 0480c73..0f1d6f3 100644
--- a/xmalloc.c
+++ b/xmalloc.c
@@ -23,6 +23,7 @@
 
 #include <err.h>
 #include <errno.h>
+#include <stdarg.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>