diff --git a/src/modules/hyprland/workspaces.cpp b/src/modules/hyprland/workspaces.cpp
index d4b9cf2d..fc94b39b 100644
--- a/src/modules/hyprland/workspaces.cpp
+++ b/src/modules/hyprland/workspaces.cpp
@@ -231,8 +231,15 @@ void Workspaces::remove_workspace(std::string name) {
 }
 
 void Workspaces::fill_persistent_workspaces() {
-  if (config_["persistent-workspaces"].isObject()) {
-    const Json::Value persistent_workspaces = config_["persistent-workspaces"];
+  if (config_["persistent_workspaces"].isObject()) {
+    spdlog::warn(
+        "persistent_workspaces is deprecated. Please change config to use persistent-workspaces.");
+  }
+
+  if (config_["persistent-workspaces"].isObject() || config_["persistent_workspaces"].isObject()) {
+    const Json::Value persistent_workspaces = config_["persistent-workspaces"].isObject()
+                                                  ? config_["persistent-workspaces"]
+                                                  : config_["persistent_workspaces"];
     const std::vector<std::string> keys = persistent_workspaces.getMemberNames();
 
     for (const std::string &key : keys) {
diff --git a/src/modules/sway/workspaces.cpp b/src/modules/sway/workspaces.cpp
index e2ddbbd3..6674731f 100644
--- a/src/modules/sway/workspaces.cpp
+++ b/src/modules/sway/workspaces.cpp
@@ -79,9 +79,18 @@ void Workspaces::onCmd(const struct Ipc::ipc_response &res) {
                                   : true;
                      });
 
+        if (config_["persistent_workspaces"].isObject()) {
+          spdlog::warn(
+              "persistent_workspaces is deprecated. Please change config to use "
+              "persistent-workspaces.");
+        }
+
         // adding persistent workspaces (as per the config file)
-        if (config_["persistent-workspaces"].isObject()) {
-          const Json::Value &p_workspaces = config_["persistent-workspaces"];
+        if (config_["persistent-workspaces"].isObject() ||
+            config_["persistent_workspaces"].isObject()) {
+          const Json::Value &p_workspaces = config_["persistent-workspaces"].isObject()
+                                                ? config_["persistent-workspaces"]
+                                                : config_["persistent_workspaces"];
           const std::vector<std::string> p_workspaces_names = p_workspaces.getMemberNames();
 
           for (const std::string &p_w_name : p_workspaces_names) {
diff --git a/src/modules/wlr/workspace_manager.cpp b/src/modules/wlr/workspace_manager.cpp
index 7f97d294..ce14b3b5 100644
--- a/src/modules/wlr/workspace_manager.cpp
+++ b/src/modules/wlr/workspace_manager.cpp
@@ -209,8 +209,17 @@ WorkspaceGroup::WorkspaceGroup(const Bar &bar, Gtk::Box &box, const Json::Value
 }
 
 auto WorkspaceGroup::fill_persistent_workspaces() -> void {
-  if (config_["persistent-workspaces"].isObject() && !workspace_manager_.all_outputs()) {
-    const Json::Value &p_workspaces = config_["persistent-workspaces"];
+  if (config_["persistent_workspaces"].isObject()) {
+    spdlog::warn(
+        "persistent_workspaces is deprecated. Please change config to use persistent-workspaces.");
+  }
+
+  if ((config_["persistent-workspaces"].isObject() ||
+       config_["persistent_workspaces"].isObject()) &&
+      !workspace_manager_.all_outputs()) {
+    const Json::Value &p_workspaces = config_["persistent-workspaces"].isObject()
+                                          ? config_["persistent-workspaces"]
+                                          : config_["persistent_workspaces"];
     const std::vector<std::string> p_workspaces_names = p_workspaces.getMemberNames();
 
     for (const std::string &p_w_name : p_workspaces_names) {