diff --git a/source/abstract/Body.cpp b/source/abstract/Body.cpp
index 0572876..31a6e58 100755
--- a/source/abstract/Body.cpp
+++ b/source/abstract/Body.cpp
@@ -110,10 +110,9 @@ Body::doesCollide(Body& other) {
  * to manage collision events.
  *
  * @param other Reference to the other Physical in the collision.
- * @param category The Category of the other object (as passed in constructor).
  */
 void
-Body::onCollide(Body& other, Category type) {
+Body::onCollide(Body& other) {
 }
 
 /**
diff --git a/source/abstract/Body.h b/source/abstract/Body.h
index d4f7e8c..2f1246c 100755
--- a/source/abstract/Body.h
+++ b/source/abstract/Body.h
@@ -68,7 +68,7 @@ public:
 	sf::Vector2i getSize() const;
 
 	virtual bool doesCollide(Body& other);
-	virtual void onCollide(Body& other, Category category);
+	virtual void onCollide(Body& other);
 
 // Public variables.
 public:
diff --git a/source/effects/Bullet.cpp b/source/effects/Bullet.cpp
index d863adc..fa393e7 100755
--- a/source/effects/Bullet.cpp
+++ b/source/effects/Bullet.cpp
@@ -41,11 +41,11 @@ Bullet::Bullet(const sf::Vector2f& position, Body& shooter, float direction,
  * @copydoc Physical::onCollide
  */
 void
-Bullet::onCollide(Body& other, Category type) {
+Bullet::onCollide(Body& other) {
 	// Make sure we do not damage twice.
 	if (!getDelete()) {
 		// Call onShot on other, with damage as param.
-		if (type == CATEGORY_ACTOR) {
+		if (other.getCategory() == CATEGORY_ACTOR) {
 			Character& a = dynamic_cast<Character&>(other);
 			a.onDamage(mDamage);
 		}
diff --git a/source/effects/Bullet.h b/source/effects/Bullet.h
index c59ae3b..bf1e34c 100755
--- a/source/effects/Bullet.h
+++ b/source/effects/Bullet.h
@@ -25,7 +25,7 @@ public:
 	Bullet(const sf::Vector2f& position, Body& shooter, float direction,
 			const Yaml& config);
 
-	void onCollide(Body& other, Category category);
+	void onCollide(Body& other);
 	bool doesCollide(Body& other);
 
 // Private variables.
diff --git a/source/sprites/Player.cpp b/source/sprites/Player.cpp
index df0ceb4..ee806ac 100644
--- a/source/sprites/Player.cpp
+++ b/source/sprites/Player.cpp
@@ -103,8 +103,8 @@ Player::onThink(float elapsedTime) {
  * Stop movement if we collide with anything except bullets.
  */
 void
-Player::onCollide(Body& other, Category category) {
-	if (category != CATEGORY_PARTICLE) {
+Player::onCollide(Body& other) {
+	if (other.getCategory() != CATEGORY_PARTICLE) {
 		setDestination(getPosition());
 	}
 }
diff --git a/source/sprites/Player.h b/source/sprites/Player.h
index c340d85..0587584 100644
--- a/source/sprites/Player.h
+++ b/source/sprites/Player.h
@@ -50,7 +50,7 @@ public:
 
 // Private functions.
 private:
-	void onCollide(Body& other, Category category);
+	void onCollide(Body& other);
 	void onThink(float elapsedTime);
 
 // Private variables.