diff --git a/rustfmt.toml b/rustfmt.toml
index 44cbfe4a3dc9..f8ff0d0fd105 100644
--- a/rustfmt.toml
+++ b/rustfmt.toml
@@ -6,13 +6,3 @@ edition = "2021"
 style_edition = "2024"
 use_small_heuristics = "Max"
 merge_derives = false
-
-ignore = [
-    "**/build/",
-    "**/target/",
-
-    # Do not format submodules
-    # For some reason, this is not working without the directory wildcard.
-    "**/firecracker",
-    "**/tests/perf/s2n-quic/",
-]
diff --git a/scripts/kani-fmt.sh b/scripts/kani-fmt.sh
index 5eca1582cc40..6a136f244ff8 100755
--- a/scripts/kani-fmt.sh
+++ b/scripts/kani-fmt.sh
@@ -19,19 +19,25 @@ error=0
 cargo fmt "$@" || error=1
 
 # Check test source files.
-# Note that this will respect the ignore section of rustfmt.toml. If you need to
-# skip any file / directory, add it there.
 TESTS=("tests" "docs/src/tutorial")
+# Add ignore patterns for code we don't want to format.
+IGNORE=("*/perf/s2n-quic/*")
+
+# Arguments for the find command for excluding the IGNORE paths
+IGNORE_ARGS=()
+for ignore in "${IGNORE[@]}"; do
+    IGNORE_ARGS+=(-not -path "$ignore")
+done
 
 for suite in "${TESTS[@]}"; do
     # Find uses breakline to split between files. This ensures that we can
     # handle files with space in their path.
     set -f; IFS=$'\n'
-    files=($(find "${suite}" -name "*.rs"))
+    files=($(find "${suite}" -name "*.rs" ${IGNORE_ARGS[@]}))
     set +f; unset IFS
     # Note: We set the configuration file here because some submodules have
     # their own configuration file.
-    rustfmt --unstable-features "$@" --config-path rustfmt.toml "${files[@]}" || error=1
+    rustfmt --config-path rustfmt.toml "${files[@]}" || error=1
 done
 
 exit $error