diff --git a/aiven/client/cli.py b/aiven/client/cli.py
index 67872c12..429a6470 100644
--- a/aiven/client/cli.py
+++ b/aiven/client/cli.py
@@ -3026,11 +3026,11 @@ def project__switch(self):
                 )
             )
 
-    @arg("service_name", help="Project name")
+    @arg("project_name", help="Project name")
     @arg.cloud
     def project__delete(self):
         """Delete a project"""
-        self.client.delete_project(project=self.args.service_name)
+        self.client.delete_project(project=self.args.project_name)
 
     @classmethod
     def _format_card_info(cls, project):