diff --git a/bin/rdebug b/bin/rdebug
index bd99d85..80dea9c 100755
--- a/bin/rdebug
+++ b/bin/rdebug
@@ -200,7 +200,7 @@ EOB
       options.host = host
     end
     opts.on('-I', '--include PATH', String, 'Add PATH to $LOAD_PATH') do |path|
-      $LOAD_PATH.unshift(path)
+      $LOAD_PATH.unshift(*path.split(':'))
     end
     opts.on('--no-control', 'Do not automatically start control thread') do
       options.control = false
diff --git a/test/tdebug.rb b/test/tdebug.rb
index 95ec483..f17861a 100755
--- a/test/tdebug.rb
+++ b/test/tdebug.rb
@@ -114,7 +114,7 @@ def debug_program(options)
     options.nx = true
   end
   opts.on("-I", "--include PATH", String, "Add PATH to $LOAD_PATH") do |path|
-    $LOAD_PATH.unshift(path)
+    $LOAD_PATH.unshift(*path.split(':'))
   end
   opts.on("-r", "--require SCRIPT", String,
           "Require the library, before executing your script") do |name|