diff --git a/source/abstract/Character.cpp b/source/abstract/Character.cpp
index 72f1f78..29b0d6c 100644
--- a/source/abstract/Character.cpp
+++ b/source/abstract/Character.cpp
@@ -67,6 +67,15 @@ Character::onDamage(int damage) {
 	}
 }
 
+/**
+ * Implement this function for any (regular) AI computations. Default implementation does nothing.
+ *
+ * @param elapsedTime Amount of time to simulate.
+ */
+void
+Character::onThink(float elapsedTime) {
+}
+
 /**
  * Called when health reaches zero. Default immplementation does nothing.
  */
diff --git a/source/abstract/Character.h b/source/abstract/Character.h
index be6da00..b0aa530 100644
--- a/source/abstract/Character.h
+++ b/source/abstract/Character.h
@@ -32,13 +32,7 @@ public:
 
 // Protected functions.
 protected:
-	/**
-	 * Implement this function for any (regular) AI computations.
-	 *
-	 * @param elapsedTime Amount of time to simulate.
-	 */
-	virtual void onThink(float elapsedTime) = 0;
-
+	virtual void onThink(float elapsedTime);
 	virtual void onDeath();
 
 // Private variables.