diff --git a/transport/Android.bp b/transport/Android.bp
index 47a4de3..4e424be 100644
--- a/transport/Android.bp
+++ b/transport/Android.bp
@@ -59,6 +59,7 @@
     srcs: [
         "HidlBinderSupport.cpp",
         "HidlTransportSupport.cpp",
+        "HidlTransportUtils.cpp",
         "ServiceManagement.cpp",
         "Static.cpp"
     ],
diff --git a/transport/HidlBinderSupport.cpp b/transport/HidlBinderSupport.cpp
index f421953..7788e33 100644
--- a/transport/HidlBinderSupport.cpp
+++ b/transport/HidlBinderSupport.cpp
@@ -28,6 +28,22 @@
 namespace android {
 namespace hardware {
 
+hidl_binder_death_recipient::hidl_binder_death_recipient(const sp<hidl_death_recipient> &recipient,
+        uint64_t cookie, const sp<::android::hidl::base::V1_0::IBase> &base) :
+    mRecipient(recipient), mCookie(cookie), mBase(base) {
+}
+
+void hidl_binder_death_recipient::binderDied(const wp<IBinder>& /*who*/) {
+    sp<hidl_death_recipient> recipient = mRecipient.promote();
+    if (recipient != nullptr) {
+        recipient->serviceDied(mCookie, mBase);
+    }
+}
+
+wp<hidl_death_recipient> hidl_binder_death_recipient::getRecipient() {
+    return mRecipient;
+}
+
 const size_t hidl_memory::kOffsetOfHandle = offsetof(hidl_memory, mHandle);
 const size_t hidl_memory::kOffsetOfName = offsetof(hidl_memory, mName);
 static_assert(hidl_memory::kOffsetOfHandle == 0, "wrong offset");
diff --git a/transport/HidlTransportUtils.cpp b/transport/HidlTransportUtils.cpp
new file mode 100644
index 0000000..eda9b8a
--- /dev/null
+++ b/transport/HidlTransportUtils.cpp
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <hidl/HidlTransportUtils.h>
+
+namespace android {
+namespace hardware {
+namespace details {
+
+Return<bool> canCastInterface(::android::hidl::base::V1_0::IBase* interface,
+        const char* castTo, bool emitError) {
+    if (interface == nullptr) {
+        return false;
+    }
+
+    bool canCast = false;
+    auto chainRet = interface->interfaceChain([&](const hidl_vec<hidl_string> &types) {
+        for (size_t i = 0; i < types.size(); i++) {
+            if (types[i] == castTo) {
+                canCast = true;
+                break;
+            }
+        }
+    });
+
+    if (!chainRet.isOk()) {
+        // call fails, propagate the error if emitError
+        return emitError
+                ? details::StatusOf<void, bool>(chainRet)
+                : Return<bool>(false);
+    }
+
+    return canCast;
+}
+
+std::string getDescriptor(::android::hidl::base::V1_0::IBase* interface) {
+    std::string myDescriptor{};
+    auto ret = interface->interfaceDescriptor([&](const hidl_string &types) {
+        myDescriptor = types.c_str();
+    });
+    ret.isOk(); // ignored, return empty string if not isOk()
+    return myDescriptor;
+}
+
+}  // namespace details
+}  // namespace hardware
+}  // namespace android
diff --git a/transport/include/hidl/HidlBinderSupport.h b/transport/include/hidl/HidlBinderSupport.h
index a82f977..6f82dbc 100644
--- a/transport/include/hidl/HidlBinderSupport.h
+++ b/transport/include/hidl/HidlBinderSupport.h
@@ -40,18 +40,9 @@
 // DeathRecipient interface.
 struct hidl_binder_death_recipient : IBinder::DeathRecipient {
     hidl_binder_death_recipient(const sp<hidl_death_recipient> &recipient,
-            uint64_t cookie, const sp<::android::hidl::base::V1_0::IBase> &base) :
-        mRecipient(recipient), mCookie(cookie), mBase(base) {
-    }
-    virtual void binderDied(const wp<IBinder>& /*who*/) {
-        sp<hidl_death_recipient> recipient = mRecipient.promote();
-        if (recipient != nullptr) {
-            recipient->serviceDied(mCookie, mBase);
-        }
-    }
-    wp<hidl_death_recipient> getRecipient() {
-        return mRecipient;
-    }
+            uint64_t cookie, const sp<::android::hidl::base::V1_0::IBase> &base);
+    virtual void binderDied(const wp<IBinder>& /*who*/);
+    wp<hidl_death_recipient> getRecipient();
 private:
     wp<hidl_death_recipient> mRecipient;
     uint64_t mCookie;
diff --git a/transport/include/hidl/HidlTransportUtils.h b/transport/include/hidl/HidlTransportUtils.h
index fbd6516..5afb9a6 100644
--- a/transport/include/hidl/HidlTransportUtils.h
+++ b/transport/include/hidl/HidlTransportUtils.h
@@ -28,40 +28,10 @@
  * @param emitError if emitError is false, return Return<bool>{false} on error; if emitError
  * is true, the Return<bool> object contains the actual error.
  */
-inline Return<bool> canCastInterface(::android::hidl::base::V1_0::IBase* interface,
-        const char* castTo, bool emitError = false) {
-    if (interface == nullptr) {
-        return false;
-    }
+Return<bool> canCastInterface(::android::hidl::base::V1_0::IBase* interface,
+        const char* castTo, bool emitError = false);
 
-    bool canCast = false;
-    auto chainRet = interface->interfaceChain([&](const hidl_vec<hidl_string> &types) {
-        for (size_t i = 0; i < types.size(); i++) {
-            if (types[i] == castTo) {
-                canCast = true;
-                break;
-            }
-        }
-    });
-
-    if (!chainRet.isOk()) {
-        // call fails, propagate the error if emitError
-        return emitError
-                ? details::StatusOf<void, bool>(chainRet)
-                : Return<bool>(false);
-    }
-
-    return canCast;
-}
-
-inline std::string getDescriptor(::android::hidl::base::V1_0::IBase* interface) {
-    std::string myDescriptor{};
-    auto ret = interface->interfaceDescriptor([&](const hidl_string &types) {
-        myDescriptor = types.c_str();
-    });
-    ret.isOk(); // ignored, return empty string if not isOk()
-    return myDescriptor;
-}
+std::string getDescriptor(::android::hidl::base::V1_0::IBase* interface);
 
 }   // namespace details
 }   // namespace hardware