diff --git a/src/interface/linux/linux_time.c b/src/interface/linux/linux_time.c
index 6d722aad..e3cbafec 100644
--- a/src/interface/linux/linux_time.c
+++ b/src/interface/linux/linux_time.c
@@ -26,6 +26,7 @@ FILE_LICENCE ( GPL2_OR_LATER );
  */
 
 #include <stdint.h>
+#include <stddef.h>
 #include <errno.h>
 #include <linux_api.h>
 #include <ipxe/time.h>
diff --git a/src/interface/linux/linux_timer.c b/src/interface/linux/linux_timer.c
index 6b4643a6..bf55cd18 100644
--- a/src/interface/linux/linux_timer.c
+++ b/src/interface/linux/linux_timer.c
@@ -18,6 +18,7 @@
 
 FILE_LICENCE(GPL2_OR_LATER);
 
+#include <stddef.h>
 #include <ipxe/timer.h>
 
 #include <linux_api.h>