diff --git a/src/kiwano-physics/PhysicWorld.cpp b/src/kiwano-physics/PhysicWorld.cpp
index fc459269..5b6b4cca 100644
--- a/src/kiwano-physics/PhysicWorld.cpp
+++ b/src/kiwano-physics/PhysicWorld.cpp
@@ -31,7 +31,7 @@ class PhysicWorld::DebugDrawer : public b2Draw
 public:
     DebugDrawer(const Size& size)
     {
-        canvas_ = MakePtr<Canvas>(size);
+        canvas_ = MakePtr<Canvas>(PixelSize(uint32_t(size.x), uint32_t(size.y)));
         ctx_    = canvas_->GetContext2D();
 
         b2Draw::SetFlags(b2Draw::e_shapeBit | b2Draw::e_jointBit | b2Draw::e_jointBit | b2Draw::e_centerOfMassBit);