diff --git a/Applications/Browser/Tab.h b/Applications/Browser/Tab.h
index f952895bb74..5ba5c212fa7 100644
--- a/Applications/Browser/Tab.h
+++ b/Applications/Browser/Tab.h
@@ -24,6 +24,8 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#pragma once
+
 #include "History.h"
 #include <AK/URL.h>
 #include <LibGUI/Widget.h>