diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 49be1f456..c28845450 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -264,8 +264,8 @@ jobs:
       - name: "rustfmt --check"
         # Workaround for rust-lang/cargo#7732
         run: |
-          if ! rustfmt --check --edition 2018 $(find . -name '*.rs' -print); then
-            printf "Please run \`rustfmt --edition 2018 \$(find . -name '*.rs' -print)\` to fix rustfmt errors.\nSee CONTRIBUTING.md for more details.\n" >&2
+          if ! rustfmt --check --edition 2018 $(git ls-files '*.rs'); then
+            printf "Please run \`rustfmt --edition 2018 \$(git ls-files '*.rs')\` to fix rustfmt errors.\nSee CONTRIBUTING.md for more details.\n" >&2
             exit 1
           fi
 
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 62d35864c..66ec614e5 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -150,7 +150,7 @@ command below instead:
 
 ```
 # Mac or Linux
-rustfmt --check --edition 2018 $(find . -name '*.rs' -print)
+rustfmt --check --edition 2018 $(git ls-files '*.rs')
 
 # Powershell
 Get-ChildItem . -Filter "*.rs" -Recurse | foreach { rustfmt --check --edition 2018 $_.FullName }