diff --git a/test/functional/test_framework/address.py b/test/functional/test_framework/address.py
index c7fbf679b69..9ac3f847b79 100644
--- a/test/functional/test_framework/address.py
+++ b/test/functional/test_framework/address.py
@@ -35,7 +35,7 @@ class AddressType(enum.Enum):
     legacy = 'legacy'  # P2PKH
 
 
-chars = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
+b58chars = '123456789ABCDEFGHJKLMNPQRSTUVWXYZabcdefghijkmnopqrstuvwxyz'
 
 
 def create_deterministic_address_bcrt1_p2tr_op_true():
@@ -59,10 +59,10 @@ def byte_to_base58(b, version):
     b += hash256(b)[:4]       # append checksum
     value = int.from_bytes(b, 'big')
     while value > 0:
-        result = chars[value % 58] + result
+        result = b58chars[value % 58] + result
         value //= 58
     while b[0] == 0:
-        result = chars[0] + result
+        result = b58chars[0] + result
         b = b[1:]
     return result
 
@@ -76,8 +76,8 @@ def base58_to_byte(s):
     n = 0
     for c in s:
         n *= 58
-        assert c in chars
-        digit = chars.index(c)
+        assert c in b58chars
+        digit = b58chars.index(c)
         n += digit
     h = '%x' % n
     if len(h) % 2:
@@ -85,7 +85,7 @@ def base58_to_byte(s):
     res = n.to_bytes((n.bit_length() + 7) // 8, 'big')
     pad = 0
     for c in s:
-        if c == chars[0]:
+        if c == b58chars[0]:
             pad += 1
         else:
             break