diff --git a/include/opcode/ChangeLog b/include/opcode/ChangeLog
index 197220d09..8ea9b98b9 100644
--- a/include/opcode/ChangeLog
+++ b/include/opcode/ChangeLog
@@ -1,3 +1,8 @@
+2010-11-23  Maciej W. Rozycki  <macro@linux-mips.org>
+
+	* mips.h (INSN_CHIP_MASK): Update according to INSN_LOONGSON_3A.
+	(INSN_LOONGSON_3A): Clear bit 31.
+
 2010-11-15  Matthew Gretton-Dann  <matthew.gretton-dann@arm.com>
 
 	PR gas/12198
diff --git a/include/opcode/mips.h b/include/opcode/mips.h
index 8817ce302..af9ad2154 100644
--- a/include/opcode/mips.h
+++ b/include/opcode/mips.h
@@ -544,7 +544,7 @@ static const unsigned int mips_isa_table[] =
   { 0x0001, 0x0003, 0x0607, 0x1e0f, 0x3e1f, 0x0a23, 0x3e63, 0x3ebf, 0x3fff };
 
 /* Masks used for Chip specific instructions.  */
-#define INSN_CHIP_MASK		  0xc3ff0820
+#define INSN_CHIP_MASK		  0xc3ff0c20
 
 /* Cavium Networks Octeon instructions.  */
 #define INSN_OCTEON		  0x00000800
@@ -593,7 +593,7 @@ static const unsigned int mips_isa_table[] =
 /* ST Microelectronics Loongson 2E.  */
 #define INSN_LOONGSON_2E          0x40000000
 /* ST Microelectronics Loongson 2F.  */
-#define INSN_LOONGSON_2F          0x80000000
+#define INSN_LOONGSON_3A          0x00000400
 /* Loongson 3A.  */
 #define INSN_LOONGSON_3A          0x80000400
 /* RMI Xlr instruction */