diff --git a/bayes_opt/parameter.py b/bayes_opt/parameter.py
index 90fea618..1bc2e0b1 100644
--- a/bayes_opt/parameter.py
+++ b/bayes_opt/parameter.py
@@ -140,7 +140,7 @@ def to_string(self, value: Any, str_len: int) -> str:
         -------
         str
         """
-        s = f"{value!r:<{str_len}}"
+        s = f"{value:<{str_len}}"
 
         if len(s) > str_len:
             return s[: str_len - 3] + "..."