diff --git a/src/ayab/com.cpp b/src/ayab/com.cpp
index 1b680b94e..910871ba1 100644
--- a/src/ayab/com.cpp
+++ b/src/ayab/com.cpp
@@ -140,7 +140,7 @@ void Com::onPacketReceived(const uint8_t *buffer, size_t size) {
     break;
 
   case static_cast<uint8_t>(AYAB_API::reqTest):
-    h_reqTest(buffer, size);
+    h_reqTest();
     break;
 
   case static_cast<uint8_t>(AYAB_API::helpCmd):
@@ -316,14 +316,8 @@ void Com::h_reqInfo() const {
  * \param buffer A pointer to a data buffer.
  * \param size The number of bytes in the data buffer.
  */
-void Com::h_reqTest(const uint8_t *buffer, size_t size) const {
-  if (size < 2U) {
-    // message is too short
-    send_cnfTest(ErrorCode::expected_longer_message);
-    return;
-  }
-
-  auto machineType = static_cast<Machine_t>(buffer[1]);
+void Com::h_reqTest() const {
+  auto machineType = static_cast<Machine_t>(GlobalKnitter::getMachineType());
 
   // Note (August 2020): the return value of this function has changed.
   // Previously, it returned `true` for success and `false` for failure.
diff --git a/src/ayab/com.h b/src/ayab/com.h
index 343c06fcf..5e95cca83 100644
--- a/src/ayab/com.h
+++ b/src/ayab/com.h
@@ -144,7 +144,7 @@ class Com : public ComInterface {
   void h_reqStart(const uint8_t *buffer, size_t size);
   void h_cnfLine(const uint8_t *buffer, size_t size);
   void h_reqInfo() const;
-  void h_reqTest(const uint8_t *buffer, size_t size) const;
+  void h_reqTest() const;
   void h_unrecognized() const;
 
   void send_cnfInfo() const;
diff --git a/test/test_com.cpp b/test/test_com.cpp
index 40bb329d7..f5021da42 100644
--- a/test/test_com.cpp
+++ b/test/test_com.cpp
@@ -130,20 +130,10 @@ TEST_F(ComTest, test_reqInit_checksum_error) {
   ASSERT_TRUE(Mock::VerifyAndClear(fsmMock));
 }
 
-TEST_F(ComTest, test_reqtest_fail) {
-  // no machineType
+TEST_F(ComTest, test_reqtest) {
   uint8_t buffer[] = {static_cast<uint8_t>(AYAB_API::reqTest)};
-  EXPECT_CALL(*fsmMock, setState(OpState::test)).Times(0);
-  expected_write_onPacketReceived(buffer, sizeof(buffer), true);
-
-  // test expectations without destroying instance
-  ASSERT_TRUE(Mock::VerifyAndClear(fsmMock));
-}
-
-TEST_F(ComTest, test_reqtest_success_KH270) {
-  uint8_t buffer[] = {static_cast<uint8_t>(AYAB_API::reqTest), static_cast<uint8_t>(Machine_t::Kh270)};
   EXPECT_CALL(*fsmMock, setState(OpState::test));
-  EXPECT_CALL(*knitterMock, setMachineType(Machine_t::Kh270));
+  EXPECT_CALL(*knitterMock, setMachineType(Machine_t::Kh910));
   EXPECT_CALL(*arduinoMock, millis);
   expected_write_onPacketReceived(buffer, sizeof(buffer), false);