diff --git a/libc/kernel/uapi/asm-generic/ipcbuf.h b/libc/kernel/uapi/asm-generic/ipcbuf.h
index 4dfb6f7..40c45ab 100644
--- a/libc/kernel/uapi/asm-generic/ipcbuf.h
+++ b/libc/kernel/uapi/asm-generic/ipcbuf.h
@@ -18,6 +18,7 @@
  ****************************************************************************/
 #ifndef __ASM_GENERIC_IPCBUF_H
 #define __ASM_GENERIC_IPCBUF_H
+#include <linux/posix_types.h>
 struct ipc64_perm {
   __kernel_key_t key;
   __kernel_uid32_t uid;