diff --git a/virtinst/cli.py b/virtinst/cli.py
index 6daea26a6..559ec9f7a 100644
--- a/virtinst/cli.py
+++ b/virtinst/cli.py
@@ -2335,7 +2335,7 @@ class ParserCPU(VirtCLIParser):
         cls.add_arg("numa.cell[0-9]*.memAccess", "memAccess",
                     find_inst_cb=cls.cell_find_inst_cb)
         cls.add_arg("numa.cell[0-9]*.discard", "discard",
-                    find_inst_cb=cls.cell_find_inst_cb)
+                    find_inst_cb=cls.cell_find_inst_cb, is_onoff=True)
         cls.add_arg("numa.cell[0-9]*.memory", "memory",
                     find_inst_cb=cls.cell_find_inst_cb)
         cls.add_arg("numa.cell[0-9]*.unit", "unit",
diff --git a/virtinst/domain/cpu.py b/virtinst/domain/cpu.py
index 1bc4d3fd8..a6a3ab3e7 100644
--- a/virtinst/domain/cpu.py
+++ b/virtinst/domain/cpu.py
@@ -33,7 +33,7 @@ class _CPUCell(XMLBuilder):
     memory = XMLProperty("./@memory", is_int=True)
     unit = XMLProperty("./@unit")
     memAccess = XMLProperty("./@memAccess")
-    discard = XMLProperty("./@discard")
+    discard = XMLProperty("./@discard", is_yesno=True)
     siblings = XMLChildProperty(_CPUCellSibling, relative_xpath="./distances")