diff --git a/.clang-format b/.clang-format
index fce23d78..3e6280fa 100644
--- a/.clang-format
+++ b/.clang-format
@@ -98,5 +98,6 @@ QualifierAlignment: Custom
 QualifierOrder: ["constexpr", "const", "inline", "static", "type"]
 SortIncludes: Never
 SortUsingDeclarations: LexicographicNumeric
+IncludeBlocksStyle: Merge
 
-WhitespaceSensitiveMacros: ["PK_PROTECTED"]
\ No newline at end of file
+WhitespaceSensitiveMacros: ["PK_PROTECTED"]
diff --git a/include/pocketpy/interpreter/vm.hpp b/include/pocketpy/interpreter/vm.hpp
index 8ddab560..c694313a 100644
--- a/include/pocketpy/interpreter/vm.hpp
+++ b/include/pocketpy/interpreter/vm.hpp
@@ -226,6 +226,7 @@ public:
     const bool enable_os;
     VM(bool enable_os = true);
 
+// clang-format off
 #if PK_REGION("Python Equivalents")
     Str py_str(PyVar obj);   // x -> str(x)
     Str py_repr(PyVar obj);  // x -> repr(x)
@@ -529,6 +530,7 @@ public:
         vm->s_data.emplace(p->type, p);
     }
 #endif
+// clang-format on
 
     template <typename T>
     Type _find_type_in_cxx_typeid_map() {