diff --git a/src/modules/physics/box2d/World.cpp b/src/modules/physics/box2d/World.cpp
index 92ff802d4..701ae21be 100644
--- a/src/modules/physics/box2d/World.cpp
+++ b/src/modules/physics/box2d/World.cpp
@@ -251,7 +251,12 @@ World::~World()
 
 void World::update(float dt)
 {
-	world->Step(dt, 8, 6);
+	update(dt, 8, 3); // Box2D 2.3's recommended defaults.
+}
+
+void World::update(float dt, int velocityIterations, int positionIterations)
+{
+	world->Step(dt, velocityIterations, positionIterations);
 
 	// Destroy all objects marked during the time step.
 	for (Body *b : destructBodies)
diff --git a/src/modules/physics/box2d/World.h b/src/modules/physics/box2d/World.h
index a747ba3b6..30b3c3940 100644
--- a/src/modules/physics/box2d/World.h
+++ b/src/modules/physics/box2d/World.h
@@ -131,6 +131,7 @@ public:
 	 * @param dt The timestep.
 	 **/
 	void update(float dt);
+	void update(float dt, int velocityIterations, int positionIterations);
 
 	// From b2ContactListener
 	void BeginContact(b2Contact *contact);
diff --git a/src/modules/physics/box2d/wrap_World.cpp b/src/modules/physics/box2d/wrap_World.cpp
index bdfa3e2e8..0319b272a 100644
--- a/src/modules/physics/box2d/wrap_World.cpp
+++ b/src/modules/physics/box2d/wrap_World.cpp
@@ -39,9 +39,19 @@ int w_World_update(lua_State *L)
 {
 	World *t = luax_checkworld(L, 1);
 	float dt = (float)luaL_checknumber(L, 2);
+
 	// Make sure the world callbacks are using the calling Lua thread.
 	t->setCallbacksL(L);
-	luax_catchexcept(L, [&](){ t->update(dt); });
+
+	if (lua_isnoneornil(L, 3))
+		luax_catchexcept(L, [&](){ t->update(dt); });
+	else
+	{
+		int velocityiterations = (int) luaL_checknumber(L, 3);
+		int positioniterations = (int) luaL_checknumber(L, 4);
+		luax_catchexcept(L, [&](){ t->update(dt, velocityiterations, positioniterations); });
+	}
+
 	return 0;
 }