Index: lib/pdk/cli/exec.rb
--- lib/pdk/cli/exec.rb.orig
+++ lib/pdk/cli/exec.rb
@@ -39,7 +39,7 @@ module PDK
       end
 
       def self.bundle(*args)
-        ensure_bin_present!(bundle_bin, 'bundler')
+        ensure_bin_present!(bundle_bin, 'bundler${GEM_BIN_SUFFIX}')
 
         execute(bundle_bin, *args)
       end
@@ -47,7 +47,7 @@ module PDK
       def self.bundle_bin
         require 'pdk/util/ruby_version'
 
-        bundle_bin = Gem.win_platform? ? 'bundle.bat' : 'bundle'
+        bundle_bin = Gem.win_platform? ? 'bundle.bat' : 'bundle${GEM_BIN_SUFFIX}'
         vendored_bin_path = File.join('private', 'ruby', PDK::Util::RubyVersion.active_ruby_version, 'bin', bundle_bin)
 
         try_vendored_bin(vendored_bin_path, bundle_bin)