diff --git a/lib/jekyll/tags/gist.rb b/lib/jekyll/tags/gist.rb
index 87a3f52f..d3eb0b37 100644
--- a/lib/jekyll/tags/gist.rb
+++ b/lib/jekyll/tags/gist.rb
@@ -11,7 +11,7 @@ module Jekyll
     end
 
     def render(context)
-      "<script src=\"http://gist.github.com/#{@gist}.js\"> </script>"
+      "<script src=\"https://gist.github.com/#{@gist}.js\"> </script>"
     end
   end
 end
diff --git a/test/test_tags.rb b/test/test_tags.rb
index 783bb531..caefb9ac 100644
--- a/test/test_tags.rb
+++ b/test/test_tags.rb
@@ -218,7 +218,7 @@ CONTENT
     end
     
     should "write script tag" do
-      assert_match %r{<script src='http://gist.github.com/#{@gist}.js'>\s</script>}, @result
+      assert_match %r{<script src='https://gist.github.com/#{@gist}.js'>\s</script>}, @result
     end
   end
 end