diff --git a/src/tools/clippy/tests/ui/to_string_in_format_args_incremental.rs b/src/tools/clippy/tests/ui/to_string_in_format_args_incremental.rs
deleted file mode 100644
index 67115f7c5a7..00000000000
--- a/src/tools/clippy/tests/ui/to_string_in_format_args_incremental.rs
+++ /dev/null
@@ -1,9 +0,0 @@
-//@run-rustfix
-//@compile-flags: -C incremental=target/debug/test/incr
-
-// see https://github.com/rust-lang/rust-clippy/issues/10969
-
-fn main() {
-    let s = "Hello, world!";
-    println!("{}", s.to_string());
-}
diff --git a/src/tools/clippy/tests/ui/to_string_in_format_args_incremental.stderr b/src/tools/clippy/tests/ui/to_string_in_format_args_incremental.stderr
deleted file mode 100644
index a992c542914..00000000000
--- a/src/tools/clippy/tests/ui/to_string_in_format_args_incremental.stderr
+++ /dev/null
@@ -1,10 +0,0 @@
-error: `to_string` applied to a type that implements `Display` in `println!` args
-  --> $DIR/to_string_in_format_args_incremental.rs:8:21
-   |
-LL |     println!("{}", s.to_string());
-   |                     ^^^^^^^^^^^^ help: remove this
-   |
-   = note: `-D clippy::to-string-in-format-args` implied by `-D warnings`
-
-error: aborting due to previous error
-