diff --git a/elf/dl-hwcaps.h b/elf/dl-hwcaps.h
index 769ecab..9a34088 100644
--- a/elf/dl-hwcaps.h
+++ b/elf/dl-hwcaps.h
@@ -20,6 +20,7 @@
 #define _DL_HWCAPS_H
 
 #include <stdint.h>
+#include <stddef.h>
 
 #include <elf/dl-tunables.h>