diff --git a/benchmark/gc/gcbench.rb b/benchmark/gc/gcbench.rb
index 16d728a150..6d5b415427 100644
--- a/benchmark/gc/gcbench.rb
+++ b/benchmark/gc/gcbench.rb
@@ -7,7 +7,7 @@ $gcprof = true
 
 opt = OptionParser.new
 opt.on('-q'){$list = false}
-opt.on('-d'){$gcprof = fales}
+opt.on('-d'){$gcprof = false}
 opt.parse!(ARGV)
 
 script = File.join(File.dirname(__FILE__), ARGV.shift)