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