diff --git a/galvani/BioLogic.py b/galvani/BioLogic.py
index be2996f..3191c07 100644
--- a/galvani/BioLogic.py
+++ b/galvani/BioLogic.py
@@ -17,10 +17,8 @@ import numpy as np
 
 if sys.version_info.major <= 2:
     str3 = str
-    from string import maketrans
 else:
     str3 = functools.partial(str, encoding='ascii')
-    maketrans = bytes.maketrans
 
 
 def fieldname_to_dtype(fieldname):
@@ -49,10 +47,10 @@ def fieldname_to_dtype(fieldname):
         raise ValueError("Invalid column header: %s" % fieldname)
 
 
-def comma_converter(float_string):
-    """Convert numbers to floats whether the decimal point is '.' or ','"""
-    trans_table = maketrans(b',', b'.')
-    return float(float_string.translate(trans_table))
+def comma_converter(float_text):
+    """Convert text to float whether the decimal point is '.' or ','"""
+    trans_table = bytes.maketrans(b',', b'.')
+    return float(float_text.translate(trans_table))
 
 
 def MPTfile(file_or_path):