diff --git a/opcodes/ChangeLog b/opcodes/ChangeLog
index 79137329f7..9ec2d50100 100644
--- a/opcodes/ChangeLog
+++ b/opcodes/ChangeLog
@@ -1,3 +1,8 @@
+2010-05-28  Matthew Gretton-Dann  <matthew.gretton-dann@arm.com>
+
+	* arm-dis.c (print_insn_neon):  Ensure disassembly of Neon 
+	constants is the same on 32-bit and 64-bit hosts.
+
 2010-05-27  Jason Duerstock  <jason.duerstock+binutils@gmail.com>
 
 	* m68k-dis.c (print_insn_m68k): Emit undefined instructions as
diff --git a/opcodes/arm-dis.c b/opcodes/arm-dis.c
index c5b00da0ec..3763c1ee7c 100644
--- a/opcodes/arm-dis.c
+++ b/opcodes/arm-dis.c
@@ -2720,7 +2720,8 @@ print_insn_neon (struct disassemble_info *info, long given, bfd_boolean thumb)
                               }
                             else
                               func (stream, "#%ld\t; 0x%.8lx",
-				    (long) (NEGATIVE_BIT_SET ? value | ~0xffffffffL : value),
+				    (long) (((value & 0x80000000L) != 0) 
+					    ? value | ~0xffffffffL : value),
 				    value);
                             break;