diff --git a/modeling/math_equivalence.py b/modeling/math_equivalence.py
index b5c066f..6d9f2d2 100644
--- a/modeling/math_equivalence.py
+++ b/modeling/math_equivalence.py
@@ -101,7 +101,7 @@ def _strip_string(string):
 
     # remove percentage
     string = string.replace("\\%", "")
-    string = string.replace("\%", "")
+    string = string.replace("%", "")
 
     # " 0." equivalent to " ." and "{0." equivalent to "{." Alternatively, add "0" if "." is the start of the string
     string = string.replace(" .", " 0.")