diff --git a/Android.bp b/Android.bp
index e1877b9..b84cc5f 100644
--- a/Android.bp
+++ b/Android.bp
@@ -44,6 +44,7 @@
     shared_libs: [
         "android.hardware.keymaster@3.0",
         "android.hardware.keymaster@4.0",
+        "android.hardware.keymaster@4.1",
         "android.hardware.boot@1.0",
         "libbase",
         "libbinder",
@@ -58,6 +59,7 @@
         "libincfs",
         "libhidlbase",
         "libkeymaster4support",
+        "libkeymaster4_1support",
         "libkeyutils",
         "liblog",
         "liblogwrap",
@@ -232,10 +234,12 @@
 
         "android.hardware.keymaster@3.0",
         "android.hardware.keymaster@4.0",
+        "android.hardware.keymaster@4.1",
         "libhardware",
         "libhardware_legacy",
         "libhidlbase",
         "libkeymaster4support",
+        "libkeymaster4_1support",
         "libutils",
     ],
 }
diff --git a/KeyStorage.cpp b/KeyStorage.cpp
index d5ac7d0..dbf190d 100644
--- a/KeyStorage.cpp
+++ b/KeyStorage.cpp
@@ -43,8 +43,8 @@
 #include <cutils/properties.h>
 
 #include <hardware/hw_auth_token.h>
-#include <keymasterV4_0/authorization_set.h>
-#include <keymasterV4_0/keymaster_utils.h>
+#include <keymasterV4_1/authorization_set.h>
+#include <keymasterV4_1/keymaster_utils.h>
 
 extern "C" {
 
diff --git a/Keymaster.cpp b/Keymaster.cpp
index aad4387..a3853f9 100644
--- a/Keymaster.cpp
+++ b/Keymaster.cpp
@@ -17,8 +17,8 @@
 #include "Keymaster.h"
 
 #include <android-base/logging.h>
-#include <keymasterV4_0/authorization_set.h>
-#include <keymasterV4_0/keymaster_utils.h>
+#include <keymasterV4_1/authorization_set.h>
+#include <keymasterV4_1/keymaster_utils.h>
 
 namespace android {
 namespace vold {
diff --git a/Keymaster.h b/Keymaster.h
index 9a0616d..049a741 100644
--- a/Keymaster.h
+++ b/Keymaster.h
@@ -24,13 +24,24 @@
 #include <utility>
 
 #include <android-base/macros.h>
-#include <keymasterV4_0/Keymaster.h>
-#include <keymasterV4_0/authorization_set.h>
+#include <keymasterV4_1/Keymaster.h>
+#include <keymasterV4_1/authorization_set.h>
 
 namespace android {
 namespace vold {
 
-namespace km = ::android::hardware::keymaster::V4_0;
+namespace km {
+
+using namespace ::android::hardware::keymaster::V4_1;
+
+// Surprisingly -- to me, at least -- this is totally fine.  You can re-define symbols that were
+// brought in via a using directive (the "using namespace") above.  In general this seems like a
+// dangerous thing to rely on, but in this case its implications are simple and straightforward:
+// km::ErrorCode refers to the 4.0 ErrorCode, though we pull everything else from 4.1.
+using ErrorCode = ::android::hardware::keymaster::V4_0::ErrorCode;
+
+}  // namespace km
+
 using KmDevice = km::support::Keymaster;
 
 // C++ wrappers to the Keymaster hidl interface.