diff --git a/op_island_align_edge.py b/op_island_align_edge.py
index 13eeadc..b15eee7 100644
--- a/op_island_align_edge.py
+++ b/op_island_align_edge.py
@@ -126,17 +126,15 @@ def align_island(uv_vert0, uv_vert1, faces):
 			loop[uv_layers].select = True
 
 	diff = uv_vert1 - uv_vert0
-	angle = math.atan2(diff.y, diff.x)%(math.pi/2)
+	current_angle = math.atan2(diff.y, diff.x)
+	angle_to_rotate = round(current_angle / (math.pi/2)) * (math.pi/2) - current_angle
 
 	bpy.ops.uv.select_linked()
 
 	bpy.context.tool_settings.transform_pivot_point = 'CURSOR'
 	bpy.ops.uv.cursor_set(location=uv_vert0 + diff/2)
 
-	if angle >= (math.pi/4):
-		angle = angle - (math.pi/2)
-
-	bpy.ops.transform.rotate(value=angle, orient_axis='Z', constraint_axis=(False, False, False), orient_type='GLOBAL', mirror=False, use_proportional_edit=False)
+	bpy.ops.transform.rotate(value=angle_to_rotate, orient_axis='Z', constraint_axis=(False, False, False), orient_type='GLOBAL', mirror=False, use_proportional_edit=False)
 
 
 bpy.utils.register_class(op)