diff --git a/tamper/greatest.py b/tamper/greatest.py
index c2b8d63f2..8b0abe058 100644
--- a/tamper/greatest.py
+++ b/tamper/greatest.py
@@ -37,7 +37,7 @@ def tamper(payload, **kwargs):
     retVal = payload
 
     if payload:
-        match = re.search(r"(?i)(\b(AND|OR)\b\s+)(?!.*\b(AND|OR)\b)([^>]+?)\s*>\s*([\d(+\-*/)]+)\s*\Z", payload)
+        match = re.search(r"(?i)(\b(AND|OR)\b\s+)(?!.*\b(AND|OR)\b)([^>]+?)\s*>\s*([^>]+)\s*\Z", payload)
 
         if match:
             _ = "%sGREATEST(%s,%s+1)=%s" % (match.group(1), match.group(4), match.group(5), match.group(4))