diff --git a/lib/uplot/command.rb b/lib/uplot/command.rb
index cc530dd..4106aa9 100644
--- a/lib/uplot/command.rb
+++ b/lib/uplot/command.rb
@@ -28,7 +28,7 @@ module Uplot
       pass      = parser.pass
       output    = parser.output
       fmt       = parser.fmt
-      @debug     = parser.debug
+      @debug    = parser.debug
 
       if command == :colors
         Plot.colors