diff --git a/app/src/main/java/no/naiv/tiltshift/effect/TiltShiftRenderer.kt b/app/src/main/java/no/naiv/tiltshift/effect/TiltShiftRenderer.kt
index e8ff4bd..f7f247e 100644
--- a/app/src/main/java/no/naiv/tiltshift/effect/TiltShiftRenderer.kt
+++ b/app/src/main/java/no/naiv/tiltshift/effect/TiltShiftRenderer.kt
@@ -219,9 +219,9 @@ class TiltShiftRenderer(
         // -activityAngle puts the world-aligned point originally at screen P
         // at the same screen P after the activity has rotated.
         val angle = when (displayRotation) {
-            Surface.ROTATION_90 -> -90f
+            Surface.ROTATION_90 -> 90f
             Surface.ROTATION_180 -> 180f
-            Surface.ROTATION_270 -> 90f
+            Surface.ROTATION_270 -> -90f
             else -> 0f
         }
         if (angle == 0f) {
diff --git a/version.properties b/version.properties
index 34449a3..6ca2659 100644
--- a/version.properties
+++ b/version.properties
@@ -1,4 +1,4 @@
 versionMajor=1
 versionMinor=1
-versionPatch=9
-versionCode=11
+versionPatch=11
+versionCode=13