diff --git a/test/unittests/interpreter/bytecode-array-writer-unittest.cc b/test/unittests/interpreter/bytecode-array-writer-unittest.cc
index 8773a2f5ab..e4a956a0ce 100644
--- a/test/unittests/interpreter/bytecode-array-writer-unittest.cc
+++ b/test/unittests/interpreter/bytecode-array-writer-unittest.cc
@@ -24,6 +24,7 @@ namespace internal {
 namespace interpreter {
 namespace bytecode_array_writer_unittest {
 
+#define B(Name) static_cast<uint8_t>(Bytecode::k##Name)
 #define R(i) static_cast<uint32_t>(Register(i).ToOperand())
 
 class BytecodeArrayWriterUnittest : public TestWithIsolateAndZone {
@@ -364,6 +365,7 @@ TEST_F(BytecodeArrayWriterUnittest, DeadcodeElimination) {
   CHECK(source_iterator.done());
 }
 
+#undef B
 #undef R
 
 }  // namespace bytecode_array_writer_unittest
diff --git a/test/unittests/interpreter/bytecode-decoder-unittest.cc b/test/unittests/interpreter/bytecode-decoder-unittest.cc
index 612b96e32c..018263f06b 100644
--- a/test/unittests/interpreter/bytecode-decoder-unittest.cc
+++ b/test/unittests/interpreter/bytecode-decoder-unittest.cc
@@ -16,6 +16,8 @@ namespace v8 {
 namespace internal {
 namespace interpreter {
 
+#define B(Name) static_cast<uint8_t>(Bytecode::k##Name)
+
 TEST(BytecodeDecoder, DecodeBytecodeAndOperands) {
   struct BytecodesAndResult {
     const uint8_t bytecode[32];
@@ -95,6 +97,8 @@ TEST(BytecodeDecoder, DecodeBytecodeAndOperands) {
   }
 }
 
+#undef B
+
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8
diff --git a/test/unittests/interpreter/bytecode-utils.h b/test/unittests/interpreter/bytecode-utils.h
index fffb7190c8..9a2cee3014 100644
--- a/test/unittests/interpreter/bytecode-utils.h
+++ b/test/unittests/interpreter/bytecode-utils.h
@@ -27,7 +27,6 @@
 #endif
 
 #define U8(i) static_cast<uint8_t>(i)
-#define B(Name) static_cast<uint8_t>(Bytecode::k##Name)
 #define REG_OPERAND(i) \
   (InterpreterFrameConstants::kRegisterFileFromFp / kPointerSize - (i))
 #define R8(i) static_cast<uint8_t>(REG_OPERAND(i))