diff --git a/Cargo.toml b/Cargo.toml
index bd9cd25d..d4a5460c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -97,6 +97,7 @@ cast_lossless = "warn"
 cast_possible_truncation = "warn"
 cast_possible_wrap = "warn"
 cast_sign_loss = "warn"
+filetype_is_file = "warn"
 float_cmp = "warn"
 lossy_float_literal = "warn"
 as_underscore = "warn"