diff --git a/lslopt/lsljson.py b/lslopt/lsljson.py
index cd3e907..27ff91e 100644
--- a/lslopt/lsljson.py
+++ b/lslopt/lsljson.py
@@ -51,8 +51,9 @@ jsonnumbug_re = re.compile(ur'-?(?:[0-9]*([Ee])-?[0-9]*\.?[0-9]*|(?=[0-9Ee.])[0-
 # BUG-6466 fixed:
 # The new RE is just a modified version of the crap, allowing + exponents and
 # disallowing zeros, sometimes even when legal (e.g. 0e0)
-jsonnum_re = re.compile(ur'-?(?:(?=[1-9]|\.(?:[^e]|$)|0(?:[^0-9e]|$))[0-9]*([Ee])[+-]?[0-9]*\.?[0-9]*|(?=[1-9]|\.(?:[^e]|$)|0(?:[^0-9e]|$))[0-9]*(\.?[0-9]*(?:[Ee][+-]?)?[0-9]*))')
-
+#jsonnum_re = re.compile(ur'-?(?:(?=[1-9]|\.(?:[^e]|$)|0(?:[^0-9e]|$))[0-9]*([Ee])[+-]?[0-9]*\.?[0-9]*|(?=[1-9]|\.(?:[^e]|$)|0(?:[^0-9e]|$))[0-9]*(\.?[0-9]*(?:[Ee][+-]?)?[0-9]*))')
+# They've fixed BUG-6657 by bringing BUG-6466 back to life.
+jsonnumbug_re = re.compile(ur'-?(?:[0-9]*([Ee])-?[0-9]*\.?[0-9]*|(?=[0-9Ee.])[0-9]*(\.?[0-9]*(?:[Ee]-?)?[0-9]*))')
 
 jsonstring_re = re.compile(ur'"(?:[^"\\]|\\.)*"')