diff --git a/opcodes/ChangeLog b/opcodes/ChangeLog
index 383e52af331..4f014590afc 100644
--- a/opcodes/ChangeLog
+++ b/opcodes/ChangeLog
@@ -1,3 +1,7 @@
+2001-12-17  Richard Henderson  <rth@redhat.com>
+
+	* alpha-opc.c (unop): Encode with RB as $sp.
+
 2001-12-07  Geoffrey Keating  <geoffk@redhat.com>
 
 	* Makefile.am: Add support for xstormy16.
diff --git a/opcodes/alpha-opc.c b/opcodes/alpha-opc.c
index d5f0314449e..7a20a55d95c 100644
--- a/opcodes/alpha-opc.c
+++ b/opcodes/alpha-opc.c
@@ -542,7 +542,8 @@ const struct alpha_opcode alpha_opcodes[] = {
   { "lda",		MEM(0x08), BASE, ARG_MEM },
   { "ldah",		MEM(0x09), BASE, ARG_MEM },
   { "ldbu",		MEM(0x0A), BWX, ARG_MEM },
-  { "unop",		MEM(0x0B), BASE, { ZA } },		/* pseudo */
+  { "unop",		MEM_(0x0B) | (30 << 16),
+			MEM_MASK, BASE, { ZA } },		/* pseudo */
   { "ldq_u",		MEM(0x0B), BASE, ARG_MEM },
   { "ldwu",		MEM(0x0C), BWX, ARG_MEM },
   { "stw",		MEM(0x0D), BWX, ARG_MEM },