diff --git a/lib/guard/listeners/darwin.rb b/lib/guard/listeners/darwin.rb
index 775a368..c6eb055 100644
--- a/lib/guard/listeners/darwin.rb
+++ b/lib/guard/listeners/darwin.rb
@@ -25,7 +25,7 @@ module Guard
 
     def self.usable?
       require 'rb-fsevent'
-      unless defined?(FSEvent::VERSION) || Gem::Version.new(FSEvent::VERSION) >= Gem::Version.new('0.3.9')
+      if !defined?(FSEvent::VERSION) || Gem::Version.new(FSEvent::VERSION) < Gem::Version.new('0.3.9')
         UI.info "Please update rb-fsevent (>= 0.3.9)"
         false
       else
diff --git a/lib/guard/listeners/linux.rb b/lib/guard/listeners/linux.rb
index f7c5668..2d53b62 100644
--- a/lib/guard/listeners/linux.rb
+++ b/lib/guard/listeners/linux.rb
@@ -32,7 +32,7 @@ module Guard
 
     def self.usable?
       require 'rb-inotify'
-      unless defined?(INotify::VERSION) || Gem::Version.new(INotify::VERSION.join('.')) >= Gem::Version.new('0.5.1')
+      if !defined?(INotify::VERSION) || Gem::Version.new(INotify::VERSION.join('.')) < Gem::Version.new('0.5.1')
         UI.info "Please update rb-inotify (>= 0.5.1)"
         false
       else