diff --git a/keymaster/4.0/Android.bp b/keymaster/4.0/Android.bp
index 2d4e7bf..34997d2 100644
--- a/keymaster/4.0/Android.bp
+++ b/keymaster/4.0/Android.bp
@@ -8,7 +8,7 @@
     },
     srcs: [
         "types.hal",
-        "IKeymaster.hal",
+        "IKeymasterDevice.hal",
     ],
     interfaces: [
         "android.hardware.keymaster@3.0",
diff --git a/keymaster/4.0/IKeymaster.hal b/keymaster/4.0/IKeymasterDevice.hal
similarity index 99%
rename from keymaster/4.0/IKeymaster.hal
rename to keymaster/4.0/IKeymasterDevice.hal
index b841832..06b4b73 100644
--- a/keymaster/4.0/IKeymaster.hal
+++ b/keymaster/4.0/IKeymasterDevice.hal
@@ -23,7 +23,7 @@
  * Keymaster device definition.  For thorough documentation see the implementer's reference, at
  * https://source.android.com/security/keystore/implementer-ref.html
  */
-interface IKeymaster {
+interface IKeymasterDevice {
 
     /**
      * Returns information about the underlying keymaster hardware.
diff --git a/keymaster/4.0/default/service.cpp b/keymaster/4.0/default/service.cpp
index adb27e1..f4b5fd3 100644
--- a/keymaster/4.0/default/service.cpp
+++ b/keymaster/4.0/default/service.cpp
@@ -16,13 +16,13 @@
 */
 
 #include <android-base/logging.h>
-#include <android/hardware/keymaster/4.0/IKeymaster.h>
+#include <android/hardware/keymaster/4.0/IKeymasterDevice.h>
 #include <hidl/HidlTransportSupport.h>
 
-#include <AndroidKeymaster4.h>
+#include <AndroidKeymaster4Device.h>
 
 int main() {
-    auto keymaster = ::keymaster::V4_0::ng::CreateKeymaster();
+    auto keymaster = ::keymaster::V4_0::ng::CreateKeymasterDevice();
     auto status = keymaster->registerAsService();
     if (status != android::OK) {
         LOG(FATAL) << "Could not register service for Keymaster 4.0 (" << status << ")";
diff --git a/keymaster/4.0/support/include/keymasterV4_0/attestation_record.h b/keymaster/4.0/support/include/keymasterV4_0/attestation_record.h
index c993d6b..203b349 100644
--- a/keymaster/4.0/support/include/keymasterV4_0/attestation_record.h
+++ b/keymaster/4.0/support/include/keymasterV4_0/attestation_record.h
@@ -17,7 +17,7 @@
 #ifndef HARDWARE_INTERFACES_KEYMASTER_40_VTS_FUNCTIONAL_ATTESTATION_RECORD_H_
 #define HARDWARE_INTERFACES_KEYMASTER_40_VTS_FUNCTIONAL_ATTESTATION_RECORD_H_
 
-#include <android/hardware/keymaster/4.0/IKeymaster.h>
+#include <android/hardware/keymaster/4.0/IKeymasterDevice.h>
 
 namespace android {
 namespace hardware {
diff --git a/keymaster/4.0/support/include/keymasterV4_0/keymaster_tags.h b/keymaster/4.0/support/include/keymasterV4_0/keymaster_tags.h
index 7e3b008..a3aae8b 100644
--- a/keymaster/4.0/support/include/keymasterV4_0/keymaster_tags.h
+++ b/keymaster/4.0/support/include/keymasterV4_0/keymaster_tags.h
@@ -59,7 +59,7 @@
  * value1.isOk() yields false, but value2.isOk() yields true, thus value2.value() is save to access.
  */
 
-#include <android/hardware/keymaster/4.0/IKeymaster.h>
+#include <android/hardware/keymaster/4.0/IKeymasterDevice.h>
 
 #include <type_traits>
 
diff --git a/keymaster/4.0/vts/functional/keymaster_hidl_hal_test.cpp b/keymaster/4.0/vts/functional/keymaster_hidl_hal_test.cpp
index d26b6b9..38dd302 100644
--- a/keymaster/4.0/vts/functional/keymaster_hidl_hal_test.cpp
+++ b/keymaster/4.0/vts/functional/keymaster_hidl_hal_test.cpp
@@ -22,7 +22,7 @@
 #include <openssl/evp.h>
 #include <openssl/x509.h>
 
-#include <android/hardware/keymaster/4.0/IKeymaster.h>
+#include <android/hardware/keymaster/4.0/IKeymasterDevice.h>
 #include <android/hardware/keymaster/4.0/types.h>
 #include <cutils/properties.h>
 #include <keymaster/keymaster_configuration.h>
@@ -409,7 +409,7 @@
         return instance;
     }
 
-    void registerTestServices() override { registerTestService<IKeymaster>(); }
+    void registerTestServices() override { registerTestService<IKeymasterDevice>(); }
 
    private:
     KeymasterHidlEnvironment(){};
@@ -428,8 +428,10 @@
 
     // SetUpTestCase runs only once per test case, not once per test.
     static void SetUpTestCase() {
-        string service_name = KeymasterHidlEnvironment::Instance()->getServiceName<IKeymaster>();
-        keymaster_ = ::testing::VtsHalHidlTargetTestBase::getService<IKeymaster>(service_name);
+        string service_name =
+            KeymasterHidlEnvironment::Instance()->getServiceName<IKeymasterDevice>();
+        keymaster_ =
+            ::testing::VtsHalHidlTargetTestBase::getService<IKeymasterDevice>(service_name);
         ASSERT_NE(keymaster_, nullptr);
 
         ASSERT_TRUE(keymaster_
@@ -447,7 +449,7 @@
 
     static void TearDownTestCase() { keymaster_.clear(); }
 
-    static IKeymaster& keymaster() { return *keymaster_; }
+    static IKeymasterDevice& keymaster() { return *keymaster_; }
     static uint32_t os_version() { return os_version_; }
     static uint32_t os_patch_level() { return os_patch_level_; }
 
@@ -874,7 +876,7 @@
     OperationHandle op_handle_ = kOpHandleSentinel;
 
    private:
-    static sp<IKeymaster> keymaster_;
+    static sp<IKeymasterDevice> keymaster_;
     static uint32_t os_version_;
     static uint32_t os_patch_level_;
 
@@ -942,7 +944,7 @@
     return true;
 }
 
-sp<IKeymaster> KeymasterHidlTest::keymaster_;
+sp<IKeymasterDevice> KeymasterHidlTest::keymaster_;
 uint32_t KeymasterHidlTest::os_version_;
 uint32_t KeymasterHidlTest::os_patch_level_;
 bool KeymasterHidlTest::is_secure_;