diff --git a/lib/irb/ext/tracer.rb b/lib/irb/ext/tracer.rb
index 5fde3409cf..3eaeb70ef2 100644
--- a/lib/irb/ext/tracer.rb
+++ b/lib/irb/ext/tracer.rb
@@ -7,7 +7,7 @@
 begin
   require "tracer"
 rescue LoadError
-  $stderr.puts "Tracer extension of IRB is enabled but tracer gem doesn't found."
+  $stderr.puts "Tracer extension of IRB is enabled but tracer gem wasn't found."
   module IRB
     class Context
       def use_tracer=(opt)