diff --git a/CHANGELOG.md b/CHANGELOG.md
index f55d752..6bf9011 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## Fixed
+- C/C++ format commands used `[]` instead of `{}` in the fd glob
+  expression so it matched single chars.
+
 ## [5.0.0] - 2024-10-15
 
 ## Added
diff --git a/c/make-derivation.nix b/c/make-derivation.nix
index 1687483..a0a00b9 100644
--- a/c/make-derivation.nix
+++ b/c/make-derivation.nix
@@ -106,7 +106,7 @@ let
           runHook preLint
           if [ -z "''${dontCheckClangFormat:-}" ]; then
             echo "🏟 Checking format in C/C++ files..."
-            ${buildPackages.fd}/bin/fd --ignore-file=.gitignore --glob '*.[h,hpp,hh,cpp,cxx,cc,c]' --exec-batch clang-format -Werror -n --style=LLVM
+            ${buildPackages.fd}/bin/fd --ignore-file=.gitignore --glob '*.{h,hpp,hh,cpp,cxx,cc,c}' --exec-batch clang-format -Werror -n --style=LLVM
             rc=$?
 
             if [ $rc -eq 0 ]; then
@@ -129,7 +129,7 @@ let
             script = ''
               runHook preFormat
               echo "🏟️ Formatting C++ files..."
-              ${buildPackages.fd}/bin/fd --glob '*.[h,hpp,hh,cpp,cxx,cc,c]' --exec-batch clang-format --style=LLVM -i "$@"
+              ${buildPackages.fd}/bin/fd --glob '*.{h,hpp,hh,cpp,cxx,cc,c}' --exec-batch clang-format --style=LLVM -i "$@"
               runHook postFormat
             '';
             description = "Format source code in the component.";