diff --git a/lib/shell/builtin-command.rb b/lib/shell/builtin-command.rb
index e419a68..a6a9d23 100644
--- a/lib/shell/builtin-command.rb
+++ b/lib/shell/builtin-command.rb
@@ -10,7 +10,7 @@
 #
 #
 
-require "shell/filter"
+require_relative "filter"
 
 class Shell
   class BuiltInCommand < Filter
diff --git a/lib/shell/command-processor.rb b/lib/shell/command-processor.rb
index b52cb00..00357e0 100644
--- a/lib/shell/command-processor.rb
+++ b/lib/shell/command-processor.rb
@@ -12,10 +12,10 @@
 
 require "e2mmap"
 
-require "shell/error"
-require "shell/filter"
-require "shell/system-command"
-require "shell/builtin-command"
+require_relative "error"
+require_relative "filter"
+require_relative "system-command"
+require_relative "builtin-command"
 
 class Shell
   # In order to execute a command on your OS, you need to define it as a
diff --git a/lib/shell/system-command.rb b/lib/shell/system-command.rb
index af22ed9..767a9ee 100644
--- a/lib/shell/system-command.rb
+++ b/lib/shell/system-command.rb
@@ -10,7 +10,7 @@
 #
 #
 
-require "shell/filter"
+require_relative "filter"
 
 class Shell
   class SystemCommand < Filter