diff --git a/gdx/src/com/badlogic/gdx/scenes/scene2d/AnimationAction.java b/gdx/src/com/badlogic/gdx/scenes/scene2d/AnimationAction.java
index 1b0cf01f..aae79169 100644
--- a/gdx/src/com/badlogic/gdx/scenes/scene2d/AnimationAction.java
+++ b/gdx/src/com/badlogic/gdx/scenes/scene2d/AnimationAction.java
@@ -61,8 +61,7 @@ protected float createInterpolatedAlpha (float delta) {
 		} else if (interpolator == null) {
 			return taken * invDuration;
 		} else {
-			float interpolatedTime = interpolator.getInterpolation(taken / duration) * duration;
-			return interpolatedTime * invDuration;
+			return interpolator.getInterpolation(taken * invDuration);
 		}
 	}