diff --git a/lib/redmine/scm/adapters/mercurial_adapter.rb b/lib/redmine/scm/adapters/mercurial_adapter.rb
index d52d863e5..3d8ef617a 100644
--- a/lib/redmine/scm/adapters/mercurial_adapter.rb
+++ b/lib/redmine/scm/adapters/mercurial_adapter.rb
@@ -294,11 +294,14 @@ module Redmine
         # Runs 'hg' command with the given args
         def hg(*args, &block)
           repo_path = root_url || url
-          full_args = [HG_BIN, '-R', repo_path, '--encoding', 'utf-8']
+          full_args = ['-R', repo_path, '--encoding', 'utf-8']
           full_args << '--config' << "extensions.redminehelper=#{HG_HELPER_EXT}"
           full_args << '--config' << 'diff.git=false'
           full_args += args
-          ret = shellout(full_args.map { |e| shell_quote e.to_s }.join(' '), &block)
+          ret = shellout(
+                   self.class.sq_bin + ' ' + full_args.map { |e| shell_quote e.to_s }.join(' '),
+                   &block
+                   )
           if $? && $?.exitstatus != 0
             raise HgCommandAborted, "hg exited with non-zero status: #{$?.exitstatus}"
           end