diff --git a/mesh_auto_mirror.py b/mesh_auto_mirror.py
index 4be783a274c2c0c8ef278b1a63bed018c11b728e..50986b237c24f2c745d3bf9bf70d719ab7c164b3 100644
--- a/mesh_auto_mirror.py
+++ b/mesh_auto_mirror.py
@@ -185,6 +185,7 @@ class BisectMirror(bpy.types.Panel):
     bl_space_type = 'VIEW_3D'
     bl_region_type = 'TOOLS'
     bl_category = "Tools"
+    bl_options = {"DEFAULT_CLOSED"}
 
     def draw(self, context):
         layout = self.layout