diff --git a/scenes/diagram/diagram.gd b/scenes/diagram/diagram.gd
index 681c3f56..8f13b070 100644
--- a/scenes/diagram/diagram.gd
+++ b/scenes/diagram/diagram.gd
@@ -93,9 +93,9 @@ func clear_all_seczap():
             child.queue_free()
 
 
-func set_seczap_color(id: int, color: Color):
+func set_seczap_color(id: int, c: Color):
     var seczap: = get_node('SECZAP%d' % id)
-    seczap.set_instance_shader_parameter('color', color)
+    seczap.set_instance_shader_parameter('color', c)
 
 
 func set_view_mode(val: int):