diff --git a/src/dex_instruction.cc b/src/dex_instruction.cc
index 4073938..d768c0b 100644
--- a/src/dex_instruction.cc
+++ b/src/dex_instruction.cc
@@ -92,6 +92,8 @@
       vA = (int8_t) INST_AA(insn);              // sign-extend 8-bit value
       break;
     case k20bc:      // op AA, kind@BBBB
+      vA = INST_A(insn);
+      vB = INST_B(insn);
       break;
     case k20t:       // op +AAAA
       vA = (int16_t) FETCH(1);                   // sign-extend 16-bit value