diff --git a/transition.go b/transition.go
index 954688e..21066c3 100644
--- a/transition.go
+++ b/transition.go
@@ -122,9 +122,9 @@ func (t *TransitionManager) Update() (
 	oldAlpha, oldScale, oldOffsetX = 1, 1, 0
 	newAlpha, newScale, newOffsetX = 1, 1, 0
 
-	slideDir := float32(-1)
+	slideDir := float32(1)
 	if t.direction == DirectionBackward {
-		slideDir = 1
+		slideDir = -1
 	}
 
 	p := t.accumSec / t.totalSec