diff --git a/man/waybar-sway-workspaces.5.scd b/man/waybar-sway-workspaces.5.scd
index 3343b8d5..8f0ac858 100644
--- a/man/waybar-sway-workspaces.5.scd
+++ b/man/waybar-sway-workspaces.5.scd
@@ -182,5 +182,6 @@ n.b.: the list of outputs can be obtained from command line using *swaymsg -t ge
 - *#workspaces button.focused*
 - *#workspaces button.urgent*
 - *#workspaces button.persistent*
+- *#workspaces button.empty*
 - *#workspaces button.current_output*
 - *#workspaces button#sway-workspace-${name}*
diff --git a/src/modules/sway/workspaces.cpp b/src/modules/sway/workspaces.cpp
index 5c8014db..68b451ce 100644
--- a/src/modules/sway/workspaces.cpp
+++ b/src/modules/sway/workspaces.cpp
@@ -319,6 +319,11 @@ auto Workspaces::update() -> void {
     } else {
       button.get_style_context()->remove_class("persistent");
     }
+    if ((*it)["nodes"].size() == 0) {
+      button.get_style_context()->add_class("empty");
+    } else {
+      button.get_style_context()->remove_class("empty");
+    }
     if ((*it)["output"].isString()) {
       if (((*it)["output"].asString()) == bar_.output->name) {
         button.get_style_context()->add_class("current_output");