diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h
index a2f9853dd88259d810e6506ec5ac48d863bc074b..df6e186da788f7103ca741b491b9f1db61809bca 100644
--- a/tools/lib/bpf/bpf.h
+++ b/tools/lib/bpf/bpf.h
@@ -22,6 +22,7 @@
 #define __BPF_BPF_H
 
 #include <linux/bpf.h>
+#include <stddef.h>
 
 int bpf_create_map(enum bpf_map_type map_type, int key_size, int value_size,
 		   int max_entries, __u32 map_flags);