diff --git a/org-clock-waybar.el b/org-clock-waybar.el
index 79ae241..ef084d7 100644
--- a/org-clock-waybar.el
+++ b/org-clock-waybar.el
@@ -64,8 +64,8 @@
     'emacs-mule)
   "Coding system of the file `org-clock-waybar-filename'.")
 
-(defun org-clock-waybar--get-clocked-task-json (buffer)
-  "Save the currently clocked-in task’s data to BUFFER.
+(defun org-clock-waybar--get-clocked-task-json ()
+  "Get the currently clocked-in task’s data as a stringified JSON object.
 
 The output is in JSON format constructed in a way so Waybar can process it.
 If there is no clocked in task, alt becomes empty and text will be set to the
@@ -75,25 +75,24 @@ value of `org-clock-waybar-not-clocked-in-text'."
         (title (when org-clock-current-task
                  (substring-no-properties org-clock-current-task)))
         (output (json-new-object)))
-    (with-current-buffer buffer
-      (setq output (json-add-to-object
-                    output
-                    "text"
-                    (if title
-                        title
-                      org-clock-waybar-not-clocked-in-text)))
-      (setq output (json-add-to-object output "alt" (if category category "")))
-      (setq output (json-add-to-object output "tooltip" ""))
-      (setq output (json-add-to-object output "class" ""))
-      (setq output (json-add-to-object output "percentage" ""))
-      (insert (json-encode output)))))
+    (setq output (json-add-to-object
+                  output
+                  "text"
+                  (if title
+                      title
+                    org-clock-waybar-not-clocked-in-text)))
+    (setq output (json-add-to-object output "alt" (if category category "")))
+    (setq output (json-add-to-object output "tooltip" ""))
+    (setq output (json-add-to-object output "class" ""))
+    (setq output (json-add-to-object output "percentage" ""))
+    (json-encode output)))
 
 (defun org-clock-waybar-save-task ()
   "Save the current clocked in task to `org-clock-waybar-filename'."
   (with-temp-buffer
     (erase-buffer)
     (set-buffer-file-coding-system org-clock-waybar-filename-coding-system)
-    (org-clock-waybar--get-clocked-task-json (current-buffer))
+    (insert (org-clock-waybar--get-clocked-task-json))
     (write-file org-clock-waybar-filename)))
 
 (defun org-clock-waybar-setup ()