diff --git a/src/textual/suggester.py b/src/textual/suggester.py
index adf61ea60..362fe89f6 100644
--- a/src/textual/suggester.py
+++ b/src/textual/suggester.py
@@ -30,7 +30,7 @@ class Suggester(ABC):
     cache: LRUCache[str, str | None] | None
     """Suggestion cache, if used."""
 
-    def __init__(self, *, use_cache: bool = True, case_sensitive: bool = True) -> None:
+    def __init__(self, *, use_cache: bool = True, case_sensitive: bool = False) -> None:
         """Create a suggester object.
 
         Args: