diff --git a/.clang-format b/.clang-format
new file mode 100644
index 0000000..201734d
--- /dev/null
+++ b/.clang-format
@@ -0,0 +1,4 @@
+BasedOnStyle: Google
+
+# Sorting includes is dangerous and can break compilation
+SortIncludes: Never
diff --git a/.dockerignore b/.dockerignore
index 3338c6a..596916b 100644
--- a/.dockerignore
+++ b/.dockerignore
@@ -1,4 +1,5 @@
 *
+!.clang-format
 !.editorconfig
 !entry.ts
 !ruff.toml
diff --git a/entry.ts b/entry.ts
index 163dab1..4982f9a 100644
--- a/entry.ts
+++ b/entry.ts
@@ -178,7 +178,7 @@ const HOOKS: Record<HookName, LockableHook> = {
       run(
         "/clang-format",
         "-i", // Edit files in-place
-        "--style=Google",
+        "--style=file:/.clang-format",
         ...sources,
       ),
     include: /\.(cpp|proto$)/,
diff --git a/test/after/hello.cpp b/test/after/hello.cpp
index 6ef0d39..b3bc5dc 100644
--- a/test/after/hello.cpp
+++ b/test/after/hello.cpp
@@ -1,4 +1,5 @@
 #include <iostream>
+#include <cmath>
 
 int main() {
   std::cout << "Hello world";
diff --git a/test/before/hello.cpp b/test/before/hello.cpp
index f460750..5a669e3 100644
--- a/test/before/hello.cpp
+++ b/test/before/hello.cpp
@@ -1,3 +1,4 @@
  #include  <iostream>
+ #include   <cmath>
 
  int  main ( ){std::cout<<"Hello world";return 0 ;}