diff --git a/app/views/projects/_md_preview.html.haml b/app/views/projects/_md_preview.html.haml
index 085f79de785..23e27c1105c 100644
--- a/app/views/projects/_md_preview.html.haml
+++ b/app/views/projects/_md_preview.html.haml
@@ -23,7 +23,7 @@
           = markdown_toolbar_button({ icon: "list-ol fw", data: { "md-tag" => "1. ", "md-prepend" => true }, title: "Add a numbered list" })
           = markdown_toolbar_button({ icon: "check-square-o fw", data: { "md-tag" => "* [ ] ", "md-prepend" => true }, title: "Add a task list" })
         .toolbar-group
-          %button.toolbar-btn.js-zen-enter.has-tooltip.hidden-xs{ type: "button", tabindex: -1, aria: { label: "Go full screen" }, title: "Go full screen", data: { container: "body" } }
+          %button.toolbar-btn.js-zen-enter.has-tooltip{ type: "button", tabindex: -1, aria: { label: "Go full screen" }, title: "Go full screen", data: { container: "body" } }
             = icon("arrows-alt fw")
 
   .md-write-holder
diff --git a/changelogs/unreleased/small-screen-fullscreen-button.yml b/changelogs/unreleased/small-screen-fullscreen-button.yml
new file mode 100644
index 00000000000..f4c269bc473
--- /dev/null
+++ b/changelogs/unreleased/small-screen-fullscreen-button.yml
@@ -0,0 +1,4 @@
+---
+title: Display fullscreen button on small screens
+merge_request: 5302
+author: winniehell