diff --git a/tools/viewer/Viewer.cpp b/tools/viewer/Viewer.cpp
index 7e345c5bbc..c11b82bec0 100644
--- a/tools/viewer/Viewer.cpp
+++ b/tools/viewer/Viewer.cpp
@@ -28,7 +28,7 @@ static void on_paint_handler(SkCanvas* canvas, void* userData) {
     return vv->onPaint(canvas);
 }
 
-static bool on_touch_handler(int owner, Window::InputState state, float x, float y, void* userData)
+static bool on_touch_handler(intptr_t owner, Window::InputState state, float x, float y, void* userData)
 {
     Viewer* viewer = reinterpret_cast<Viewer*>(userData);
 
@@ -332,7 +332,7 @@ void Viewer::onPaint(SkCanvas* canvas) {
     fCommands.drawHelp(canvas);
 }
 
-bool Viewer::onTouch(int owner, Window::InputState state, float x, float y) {
+bool Viewer::onTouch(intptr_t owner, Window::InputState state, float x, float y) {
     void* castedOwner = reinterpret_cast<void*>(owner);
     SkPoint touchPoint = fDefaultMatrixInv.mapXY(x, y);
     switch (state) {
diff --git a/tools/viewer/Viewer.h b/tools/viewer/Viewer.h
index e752b3f939..4b260dfc1d 100644
--- a/tools/viewer/Viewer.h
+++ b/tools/viewer/Viewer.h
@@ -24,7 +24,7 @@ public:
 
     void onPaint(SkCanvas* canvas);
     void onIdle(double ms) override;
-    bool onTouch(int owner, sk_app::Window::InputState state, float x, float y);
+    bool onTouch(intptr_t owner, sk_app::Window::InputState state, float x, float y);
     void onUIStateChanged(const SkString& stateName, const SkString& stateValue);
 
 private:
diff --git a/tools/viewer/sk_app/Window.cpp b/tools/viewer/sk_app/Window.cpp
index 1c798df399..7ec8baae36 100644
--- a/tools/viewer/sk_app/Window.cpp
+++ b/tools/viewer/sk_app/Window.cpp
@@ -27,7 +27,7 @@ static bool default_mouse_func(int x, int y, Window::InputState state, uint32_t
     return false;
 }
 
-static bool default_touch_func(int owner, Window::InputState state, float x, float y,
+static bool default_touch_func(intptr_t owner, Window::InputState state, float x, float y,
                                void* userData) {
     return false;
 }
@@ -62,7 +62,7 @@ bool Window::onMouse(int x, int y, InputState state, uint32_t modifiers) {
     return fMouseFunc(x, y, state, modifiers, fMouseUserData);
 }
 
-bool Window::onTouch(int owner, InputState state, float x, float y) {
+bool Window::onTouch(intptr_t owner, InputState state, float x, float y) {
     return fTouchFunc(owner, state, x, y, fTouchUserData);
 }
 
diff --git a/tools/viewer/sk_app/Window.h b/tools/viewer/sk_app/Window.h
index 9ca4231c80..29c85b9e78 100644
--- a/tools/viewer/sk_app/Window.h
+++ b/tools/viewer/sk_app/Window.h
@@ -111,7 +111,7 @@ public:
     typedef bool(*OnCharFunc)(SkUnichar c, uint32_t modifiers, void* userData);
     typedef bool(*OnKeyFunc)(Key key, InputState state, uint32_t modifiers, void* userData);
     typedef bool(*OnMouseFunc)(int x, int y, InputState state, uint32_t modifiers, void* userData);
-    typedef bool(*OnTouchFunc)(int owner, InputState state, float x, float y, void* userData);
+    typedef bool(*OnTouchFunc)(intptr_t owner, InputState state, float x, float y, void* userData);
     typedef void(*OnUIStateChangedFunc)(
             const SkString& stateName, const SkString& stateValue, void* userData);
     typedef void(*OnPaintFunc)(SkCanvas*, void* userData);
@@ -149,7 +149,7 @@ public:
     bool onChar(SkUnichar c, uint32_t modifiers);
     bool onKey(Key key, InputState state, uint32_t modifiers);
     bool onMouse(int x, int y, InputState state, uint32_t modifiers);
-    bool onTouch(int owner, InputState state, float x, float y);  // multi-owner = multi-touch
+    bool onTouch(intptr_t owner, InputState state, float x, float y);  // multi-owner = multi-touch
     void onUIStateChanged(const SkString& stateName, const SkString& stateValue);
     void onPaint();
     void onResize(uint32_t width, uint32_t height);