diff --git a/source/World.cpp b/source/World.cpp
index c9db57c..8eb0147 100755
--- a/source/World.cpp
+++ b/source/World.cpp
@@ -236,7 +236,7 @@ World::step(int elapsed) {
 				it--;
 			}
 			// Apply movement for movable sprites.
-			else if ((*it)->isMovable()) {
+			else if ((*it)->getSpeed() != sf::Vector2f()) {
 				sf::Vector2f speed = spriteA->getSpeed();
 				speed *= elapsed / 1000.0f;
 				bool overlap = false;
diff --git a/source/abstract/Sprite.cpp b/source/abstract/Sprite.cpp
index d4d5d2e..1e72122 100755
--- a/source/abstract/Sprite.cpp
+++ b/source/abstract/Sprite.cpp
@@ -149,15 +149,6 @@ Sprite::collisionEnabled(Category category) const {
 	return (category & mMask) != 0;
 }
 
-/**
- * Returns true if this sprite is able to move, currently decided by shape
- * (circle can move, rectangle can not).
- */
-bool
-Sprite::isMovable() const {
-	return mShape.type == Shape::Type::CIRCLE;
-}
-
 /**
  * Called when a collision with another Sprite occured. Override this method
  * to manage collision events.
diff --git a/source/abstract/Sprite.h b/source/abstract/Sprite.h
index e6b5b7b..0a50ea5 100755
--- a/source/abstract/Sprite.h
+++ b/source/abstract/Sprite.h
@@ -66,7 +66,6 @@ public:
 	sf::Vector2f getSize() const;
 	virtual void draw(sf::RenderTarget& target, sf::RenderStates states) const;
 	bool collisionEnabled(Category category) const;
-	bool isMovable() const;
 
 	virtual void onCollide(std::shared_ptr<Sprite> other);