diff --git a/src/wic/ksparser.py b/src/wic/ksparser.py
index a73ae56cd196..528a8180826f 100644
--- a/src/wic/ksparser.py
+++ b/src/wic/ksparser.py
@@ -15,6 +15,7 @@
 import os
 import shlex
 import logging
+import math
 import re
 import uuid
 
@@ -98,7 +99,7 @@ def overheadtype(arg):
     except ValueError:
         raise ArgumentTypeError("Invalid value: %r" % arg)
 
-    if result < 1.0:
+    if not math.isfinite(result) or result < 1.0:
         raise ArgumentTypeError("Overhead factor should be > 1.0, not %r" % arg)
 
     return result