diff --git a/sysdeps/unix/sysv/linux/alpha/bits/signum.h b/sysdeps/unix/sysv/linux/alpha/bits/signum.h
index ac5c34cd1a..6b1399eb12 100644
--- a/sysdeps/unix/sysv/linux/alpha/bits/signum.h
+++ b/sysdeps/unix/sysv/linux/alpha/bits/signum.h
@@ -1,5 +1,5 @@
 /* Signal number definitions.  Linux/Alpha version.
-   Copyright (C) 1996, 1997 Free Software Foundation, Inc.
+   Copyright (C) 1996, 1997, 1998 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -24,6 +24,10 @@
 #define SIG_DFL ((__sighandler_t) 0) /* Default action.  */
 #define SIG_IGN ((__sighandler_t) 1) /* Ignore signal.  */
 
+#ifdef __USE_UNIX98
+# define SIG_HOLD	((__sighandler_t) 2)	/* Add signal to hold mask.  */
+#endif
+
 /*
  * Linux/AXP has different signal numbers that Linux/i386: I'm trying
  * to make it OSF/1 binary compatible, at least for normal binaries.
diff --git a/sysdeps/unix/sysv/linux/mips/bits/signum.h b/sysdeps/unix/sysv/linux/mips/bits/signum.h
index 5254a2b420..c30abe3841 100644
--- a/sysdeps/unix/sysv/linux/mips/bits/signum.h
+++ b/sysdeps/unix/sysv/linux/mips/bits/signum.h
@@ -1,5 +1,5 @@
 /* Signal number definitions.  Linux version.
-   Copyright (C) 1995, 1997 Free Software Foundation, Inc.
+   Copyright (C) 1995, 1997, 1998 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -24,6 +24,10 @@
 #define __need_signums
 #include <asm/signal.h>
 
+#ifdef __USE_UNIX98
+# define SIG_HOLD	((__sighandler_t) 2)	/* Add signal to hold mask.  */
+#endif
+
 #endif	/* <signal.h> included.  */
 
 #define __need__nsig