diff --git a/psycopg/cursor_type.c b/psycopg/cursor_type.c
index 199c8a30..7bf588fe 100644
--- a/psycopg/cursor_type.c
+++ b/psycopg/cursor_type.c
@@ -1133,7 +1133,7 @@ exit:
             }
         }
     }
-    PyMem_Del(scpnames);
+    PyMem_Free(scpnames);
     Py_XDECREF(pname);
     Py_XDECREF(pnames);
     Py_XDECREF(operation);