diff --git a/opcodes/microblaze-opc.h b/opcodes/microblaze-opc.h
index dd56ab506..124db53b0 100644
--- a/opcodes/microblaze-opc.h
+++ b/opcodes/microblaze-opc.h
@@ -407,7 +407,7 @@ struct op_code_struct
   {"sleep",     INST_TYPE_NONE,  INST_PC_OFFSET, NO_DELAY_SLOT, IMMVAL_MASK_NON_SPECIAL, 0xBA020004, OPCODE_MASK_HN,   invalid_inst, special_inst }, /* translates to mbar 16.  */
   {"swapb",     INST_TYPE_RD_R1, INST_NO_OFFSET, NO_DELAY_SLOT, IMMVAL_MASK_NON_SPECIAL, 0x900001E0, OPCODE_MASK_H4,   swapb,     arithmetic_inst },
   {"swaph",     INST_TYPE_RD_R1, INST_NO_OFFSET, NO_DELAY_SLOT, IMMVAL_MASK_NON_SPECIAL, 0x900001E2, OPCODE_MASK_H4,   swaph,     arithmetic_inst },
-  {"", 0, 0, 0, 0, 0, 0, 0, 0},
+  {NULL, 0, 0, 0, 0, 0, 0, 0, 0},
 };
 
 /* Prefix for register names.  */