diff --git a/disassembler/disassembler_x86.cc b/disassembler/disassembler_x86.cc
index 9bee104..d4574f4 100644
--- a/disassembler/disassembler_x86.cc
+++ b/disassembler/disassembler_x86.cc
@@ -928,6 +928,11 @@
         has_modrm = true;
         load = true;
         break;
+      case 0xBD:
+        opcode1 = "bsr";
+        has_modrm = true;
+        load = true;
+        break;
       case 0xBE:
         opcode1 = "movsxb";
         has_modrm = true;