diff --git a/lib/libvarnish/vsmw.c b/lib/libvarnish/vsmw.c
index 0f6cb08b58..d57557e602 100644
--- a/lib/libvarnish/vsmw.c
+++ b/lib/libvarnish/vsmw.c
@@ -38,6 +38,7 @@
 #include <fcntl.h>
 #include <stdarg.h>
 #include <stdio.h>
+#include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>