diff --git a/include/haproxy/bug.h b/include/haproxy/bug.h
index 7db65c0d2..7d66f554b 100644
--- a/include/haproxy/bug.h
+++ b/include/haproxy/bug.h
@@ -29,6 +29,7 @@
 #define _HAPROXY_BUG_H
 
 #include <stddef.h>
+#include <sys/types.h>
 #include <haproxy/atomic.h>
 #include <haproxy/compiler.h>