diff --git a/lib/git/lib.rb b/lib/git/lib.rb
index 1b586f60..1ac987ff 100644
--- a/lib/git/lib.rb
+++ b/lib/git/lib.rb
@@ -1040,10 +1040,19 @@ def commit_tree(tree, opts = {})
       t.write(opts[:message])
       t.close
 
+      # Adapted from activesupport Array.wrap
+      parents = if opts[:parents].nil?
+        []
+      elsif opts[:parents].respond_to?(:to_ary)
+        opts[:parents].to_ary || [opts[:parents]]
+      else
+        [opts[:parents]]
+      end
+      parents << opts[:parent] if opts[:parent]
+
       arr_opts = []
       arr_opts << tree
-      arr_opts << '-p' << opts[:parent] if opts[:parent]
-      arr_opts += [opts[:parents]].map { |p| ['-p', p] }.flatten if opts[:parents]
+      arr_opts += parents.map { |p| ['-p', p] }.flatten
       command('commit-tree', *arr_opts, redirect: "< #{escape t.path}")
     end
 
diff --git a/tests/units/test_tree_ops.rb b/tests/units/test_tree_ops.rb
index 1f38cae9..b4e4ce32 100644
--- a/tests/units/test_tree_ops.rb
+++ b/tests/units/test_tree_ops.rb
@@ -79,6 +79,14 @@ def test_read_tree
       assert(c.commit?)
       assert_equal('b40f7a9072cdec637725700668f8fdebe39e6d38', c.gtree.sha)
 
+      c = g.commit_tree(tr, :parent => 'HEAD')
+      assert(c.commit?)
+      assert_equal('b40f7a9072cdec637725700668f8fdebe39e6d38', c.gtree.sha)
+
+      c = g.commit_tree(tr, :parents => ['HEAD', 'testbranch1'])
+      assert(c.commit?)
+      assert_equal('b40f7a9072cdec637725700668f8fdebe39e6d38', c.gtree.sha)
+
       tmp = Tempfile.new('tesxt')
       tmppath = tmp.path
       tmp.close