diff --git a/datasette/app.py b/datasette/app.py
index 8020c5da..f732f95c 100644
--- a/datasette/app.py
+++ b/datasette/app.py
@@ -1617,9 +1617,7 @@ class Datasette:
         try:
             return self.get_database(route=database_route)
         except KeyError:
-            raise DatabaseNotFound(
-                "Database not found: {}".format(database_route), database_route
-            )
+            raise DatabaseNotFound(database_route)
 
     async def resolve_table(self, request):
         db = await self.resolve_database(request)
diff --git a/datasette/utils/asgi.py b/datasette/utils/asgi.py
index 2fad1d42..b3f00bb3 100644
--- a/datasette/utils/asgi.py
+++ b/datasette/utils/asgi.py
@@ -23,9 +23,9 @@ class NotFound(Base400):
 
 
 class DatabaseNotFound(NotFound):
-    def __init__(self, message, database_name):
-        super().__init__(message)
+    def __init__(self, database_name):
         self.database_name = database_name
+        super().__init__("Database not found")
 
 
 class TableNotFound(NotFound):
diff --git a/tests/test_api_write.py b/tests/test_api_write.py
index 7dbe12b5..2cd87858 100644
--- a/tests/test_api_write.py
+++ b/tests/test_api_write.py
@@ -133,7 +133,7 @@ async def test_insert_rows(ds_write, return_rows):
             {},
             None,
             404,
-            ["Database not found: data2"],
+            ["Database not found"],
         ),
         (
             "/data/docs2/-/insert",