diff --git a/lib/fog/proxmox/auth/token/access_ticket.rb b/lib/fog/proxmox/auth/token/access_ticket.rb
index 56747df..0c099e5 100644
--- a/lib/fog/proxmox/auth/token/access_ticket.rb
+++ b/lib/fog/proxmox/auth/token/access_ticket.rb
@@ -48,11 +48,11 @@ def auth_path(_params = {})
           def auth_body(params = {})
             raise URIError, 'URI params is required' if params.nil? || params.empty?
 
-            if params[:proxmox_username].nil? || params[:proxmox_username].empty?
+            if params[:proxmox_username].nil? || params[:proxmox_username].to_s.strip.empty?
               raise URIError,
                     'proxmox_username is required'
             end
-            if params[:proxmox_password].nil? || params[:proxmox_password].empty?
+            if params[:proxmox_password].nil? || params[:proxmox_password].to_s.strip.empty?
               raise URIError,
                     'proxmox_password is required'
             end