diff --git a/plugins/Math/plugin.py b/plugins/Math/plugin.py
index 683b9c709..a074b1417 100644
--- a/plugins/Math/plugin.py
+++ b/plugins/Math/plugin.py
@@ -106,6 +106,7 @@ class Math(callbacks.Plugin):
     _mathEnv['abs'] = abs
     _mathEnv['max'] = max
     _mathEnv['min'] = min
+    _mathEnv.pop('factorial')
     _mathRe = re.compile(r'((?:(?<![A-Fa-f\d)])-)?'
                          r'(?:0x[A-Fa-f\d]+|'
                          r'0[0-7]+|'