diff --git a/src/dawn_native/Fence.cpp b/src/dawn_native/Fence.cpp
index f16274e9d3..5c2a64fe14 100644
--- a/src/dawn_native/Fence.cpp
+++ b/src/dawn_native/Fence.cpp
@@ -60,12 +60,14 @@ namespace dawn_native {
         if (IsError()) {
             return 0;
         }
-        return mCompletedValue;
+        return uint64_t(mCompletedValue);
     }
 
-    void Fence::OnCompletion(uint64_t value,
+    void Fence::OnCompletion(uint64_t apiValue,
                              wgpu::FenceOnCompletionCallback callback,
                              void* userdata) {
+        FenceAPISerial value(apiValue);
+
         WGPUFenceCompletionStatus status;
         if (GetDevice()->ConsumedError(ValidateOnCompletion(value, &status))) {
             callback(status, userdata);
@@ -84,7 +86,7 @@ namespace dawn_native {
         mRequests.Enqueue(std::move(request), value);
     }
 
-    uint64_t Fence::GetSignaledValue() const {
+    FenceAPISerial Fence::GetSignaledValue() const {
         ASSERT(!IsError());
         return mSignalValue;
     }
@@ -94,13 +96,13 @@ namespace dawn_native {
         return mQueue.Get();
     }
 
-    void Fence::SetSignaledValue(uint64_t signalValue) {
+    void Fence::SetSignaledValue(FenceAPISerial signalValue) {
         ASSERT(!IsError());
         ASSERT(signalValue > mSignalValue);
         mSignalValue = signalValue;
     }
 
-    void Fence::SetCompletedValue(uint64_t completedValue) {
+    void Fence::SetCompletedValue(FenceAPISerial completedValue) {
         ASSERT(!IsError());
         ASSERT(completedValue <= mSignalValue);
         ASSERT(completedValue > mCompletedValue);
@@ -116,7 +118,7 @@ namespace dawn_native {
         mRequests.ClearUpTo(mCompletedValue);
     }
 
-    MaybeError Fence::ValidateOnCompletion(uint64_t value,
+    MaybeError Fence::ValidateOnCompletion(FenceAPISerial value,
                                            WGPUFenceCompletionStatus* status) const {
         *status = WGPUFenceCompletionStatus_DeviceLost;
         DAWN_TRY(GetDevice()->ValidateIsAlive());
diff --git a/src/dawn_native/Fence.h b/src/dawn_native/Fence.h
index b4fb821412..f5f4be6e34 100644
--- a/src/dawn_native/Fence.h
+++ b/src/dawn_native/Fence.h
@@ -18,6 +18,7 @@
 #include "common/SerialMap.h"
 #include "dawn_native/Error.h"
 #include "dawn_native/Forward.h"
+#include "dawn_native/IntegerTypes.h"
 #include "dawn_native/ObjectBase.h"
 
 #include "dawn_native/dawn_platform.h"
@@ -34,7 +35,7 @@ namespace dawn_native {
 
         static Fence* MakeError(DeviceBase* device);
 
-        uint64_t GetSignaledValue() const;
+        FenceAPISerial GetSignaledValue() const;
         const QueueBase* GetQueue() const;
 
         // Dawn API
@@ -44,24 +45,25 @@ namespace dawn_native {
       protected:
         friend class QueueBase;
         friend class FenceSignalTracker;
-        void SetSignaledValue(uint64_t signalValue);
-        void SetCompletedValue(uint64_t completedValue);
+        void SetSignaledValue(FenceAPISerial signalValue);
+        void SetCompletedValue(FenceAPISerial completedValue);
 
       private:
         Fence(DeviceBase* device, ObjectBase::ErrorTag tag);
         ~Fence() override;
 
-        MaybeError ValidateOnCompletion(uint64_t value, WGPUFenceCompletionStatus* status) const;
+        MaybeError ValidateOnCompletion(FenceAPISerial value,
+                                        WGPUFenceCompletionStatus* status) const;
 
         struct OnCompletionData {
             wgpu::FenceOnCompletionCallback completionCallback = nullptr;
             void* userdata = nullptr;
         };
 
-        uint64_t mSignalValue;
-        uint64_t mCompletedValue;
+        FenceAPISerial mSignalValue;
+        FenceAPISerial mCompletedValue;
         Ref<QueueBase> mQueue;
-        SerialMap<Serial, OnCompletionData> mRequests;
+        SerialMap<FenceAPISerial, OnCompletionData> mRequests;
     };
 
 }  // namespace dawn_native
diff --git a/src/dawn_native/FenceSignalTracker.cpp b/src/dawn_native/FenceSignalTracker.cpp
index b8243a256c..2147ea6552 100644
--- a/src/dawn_native/FenceSignalTracker.cpp
+++ b/src/dawn_native/FenceSignalTracker.cpp
@@ -26,7 +26,7 @@ namespace dawn_native {
         ASSERT(mFencesInFlight.Empty());
     }
 
-    void FenceSignalTracker::UpdateFenceOnComplete(Fence* fence, uint64_t value) {
+    void FenceSignalTracker::UpdateFenceOnComplete(Fence* fence, FenceAPISerial value) {
         // Because we currently only have a single queue, we can simply update
         // the fence completed value once the last submitted serial has passed.
         mFencesInFlight.Enqueue(FenceInFlight{fence, value},
diff --git a/src/dawn_native/FenceSignalTracker.h b/src/dawn_native/FenceSignalTracker.h
index 623140f316..f1ea883012 100644
--- a/src/dawn_native/FenceSignalTracker.h
+++ b/src/dawn_native/FenceSignalTracker.h
@@ -17,6 +17,7 @@
 
 #include "common/RefCounted.h"
 #include "common/SerialQueue.h"
+#include "dawn_native/IntegerTypes.h"
 
 namespace dawn_native {
 
@@ -26,14 +27,14 @@ namespace dawn_native {
     class FenceSignalTracker {
         struct FenceInFlight {
             Ref<Fence> fence;
-            uint64_t value;
+            FenceAPISerial value;
         };
 
       public:
         FenceSignalTracker(DeviceBase* device);
         ~FenceSignalTracker();
 
-        void UpdateFenceOnComplete(Fence* fence, uint64_t value);
+        void UpdateFenceOnComplete(Fence* fence, FenceAPISerial value);
 
         void Tick(Serial finishedSerial);
 
diff --git a/src/dawn_native/IntegerTypes.h b/src/dawn_native/IntegerTypes.h
index 3b72722502..f7e97abe28 100644
--- a/src/dawn_native/IntegerTypes.h
+++ b/src/dawn_native/IntegerTypes.h
@@ -54,6 +54,9 @@ namespace dawn_native {
     // that was sent.
     using MapRequestID = TypedInteger<struct MapRequestIDT, uint64_t>;
 
+    // The type for the WebGPU API fence serial values.
+    using FenceAPISerial = TypedInteger<struct FenceAPISerialT, uint64_t>;
+
 }  // namespace dawn_native
 
 #endif  // DAWNNATIVE_INTEGERTYPES_H_
diff --git a/src/dawn_native/Queue.cpp b/src/dawn_native/Queue.cpp
index 3b7376eff9..c655139d4b 100644
--- a/src/dawn_native/Queue.cpp
+++ b/src/dawn_native/Queue.cpp
@@ -155,7 +155,9 @@ namespace dawn_native {
         }
     }
 
-    void QueueBase::Signal(Fence* fence, uint64_t signalValue) {
+    void QueueBase::Signal(Fence* fence, uint64_t apiSignalValue) {
+        FenceAPISerial signalValue(apiSignalValue);
+
         DeviceBase* device = GetDevice();
         if (device->ConsumedError(ValidateSignal(fence, signalValue))) {
             return;
@@ -312,7 +314,7 @@ namespace dawn_native {
         return {};
     }
 
-    MaybeError QueueBase::ValidateSignal(const Fence* fence, uint64_t signalValue) const {
+    MaybeError QueueBase::ValidateSignal(const Fence* fence, FenceAPISerial signalValue) const {
         DAWN_TRY(GetDevice()->ValidateIsAlive());
         DAWN_TRY(GetDevice()->ValidateObject(this));
         DAWN_TRY(GetDevice()->ValidateObject(fence));
diff --git a/src/dawn_native/Queue.h b/src/dawn_native/Queue.h
index 2a0f7fc4d0..cf1d384082 100644
--- a/src/dawn_native/Queue.h
+++ b/src/dawn_native/Queue.h
@@ -17,6 +17,7 @@
 
 #include "dawn_native/Error.h"
 #include "dawn_native/Forward.h"
+#include "dawn_native/IntegerTypes.h"
 #include "dawn_native/ObjectBase.h"
 
 #include "dawn_native/dawn_platform.h"
@@ -65,7 +66,7 @@ namespace dawn_native {
                                             const Extent3D& writeSize);
 
         MaybeError ValidateSubmit(uint32_t commandCount, CommandBufferBase* const* commands) const;
-        MaybeError ValidateSignal(const Fence* fence, uint64_t signalValue) const;
+        MaybeError ValidateSignal(const Fence* fence, FenceAPISerial signalValue) const;
         MaybeError ValidateCreateFence(const FenceDescriptor* descriptor) const;
         MaybeError ValidateWriteBuffer(const BufferBase* buffer,
                                        uint64_t bufferOffset,