diff --git a/sysdeps/unix/sysv/linux/alpha/bits/types.h b/sysdeps/unix/sysv/linux/alpha/bits/types.h
index 9acdf0c490..9033fdb362 100644
--- a/sysdeps/unix/sysv/linux/alpha/bits/types.h
+++ b/sysdeps/unix/sysv/linux/alpha/bits/types.h
@@ -77,6 +77,9 @@ typedef long int __swblk_t;		/* Type of a swap block maybe?  */
 typedef long int __clock_t;
 typedef int __key_t;			/* Type of a SYSV IPC key. */
 
+/* Used in `struct shmid_ds'.  */
+typedef int __ipc_pid_t;
+
 /* One element in the file descriptor mask array.  */
 typedef unsigned long int __fd_mask;