diff --git a/opt/simulator/resources/firmware/start_qemu.sh b/opt/simulator/resources/firmware/start_qemu.sh
index cfdad8b..64fba99 100644
--- a/opt/simulator/resources/firmware/start_qemu.sh
+++ b/opt/simulator/resources/firmware/start_qemu.sh
@@ -75,6 +75,8 @@ fi
 host_os=$(uname -s)
 echo "Host OS type : \"$(uname -v)\"."
 if [ "$host_os" = "Linux" ]; then
+    export GDK_BACKEND=x11
+
     qemu_bin="qemu_linux/qemu-system-arm"
     check_file_exists "$qemu_bin"