1 files changed, 1 insertions, 0 deletions

diff --git a/icmp.h b/icmp.h
index eed1714..c242207 100644
--- a/icmp.h
+++ b/icmp.h
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <stddef.h>
 #include <stdint.h>