diff --git a/pandas/core/indexes/base.py b/pandas/core/indexes/base.py
index 020f431d67da2..b9727beba1026 100644
--- a/pandas/core/indexes/base.py
+++ b/pandas/core/indexes/base.py
@@ -2249,8 +2249,8 @@ def is_integer(self) -> bool:
         False
         """
         warnings.warn(
-            f"{type(self).__name__}.is_integer is deprecated."
-            "Use pandas.api.types.is_integer_dtype instead",
+            f"{type(self).__name__}.is_integer is deprecated. "
+            "Use pandas.api.types.is_integer_dtype instead.",
             FutureWarning,
             stacklevel=find_stack_level(),
         )