diff --git a/include/pocketpy/common/serialize.h b/include/pocketpy/common/serialize.h
index 7baa436c..1d5b1d06 100644
--- a/include/pocketpy/common/serialize.h
+++ b/include/pocketpy/common/serialize.h
@@ -27,7 +27,7 @@ typedef struct c11_deserializer {
 
 void c11_deserializer__ctor(c11_deserializer* self, const void* data, int size);
 void c11_deserializer__dtor(c11_deserializer* self);
-bool c11_deserializer__check_header(c11_deserializer* self, int16_t magic, int8_t major_ver, int8_t minor_ver);
+bool c11_deserializer__check_header(c11_deserializer* self, int16_t magic, int8_t major_ver, int8_t minor_ver_min);
 const char* c11_deserializer__read_cstr(c11_deserializer* self);
 void* c11_deserializer__read_bytes(c11_deserializer* self, int size);
 
diff --git a/src/common/serialize.c b/src/common/serialize.c
index 40a001a2..f3920641 100644
--- a/src/common/serialize.c
+++ b/src/common/serialize.c
@@ -56,7 +56,7 @@ bool c11_deserializer__error(c11_deserializer* self, const char* msg){
     return false;
 }
 
-bool c11_deserializer__check_header(c11_deserializer* self, int16_t magic, int8_t major_ver, int8_t minor_ver){
+bool c11_deserializer__check_header(c11_deserializer* self, int16_t magic, int8_t major_ver, int8_t minor_ver_min){
     if(self->size < 8){
         return c11_deserializer__error(self, "bad header: size < 8");
     }
@@ -80,7 +80,7 @@ bool c11_deserializer__check_header(c11_deserializer* self, int16_t magic, int8_
     if(self->major_ver != major_ver){
         return c11_deserializer__error(self, "bad header: major version mismatch");
     }
-    if(self->minor_ver < minor_ver){
+    if(self->minor_ver < minor_ver_min){
         // file_ver: 1.1, require_ver: 1.0 => ok
         // file_ver: 1.1, require_ver: 1.1 => ok
         // file_ver: 1.1, require_ver: 1.2 => error
diff --git a/src/objects/codeobject_ser.c b/src/objects/codeobject_ser.c
index a94fa92c..ef95d129 100644
--- a/src/objects/codeobject_ser.c
+++ b/src/objects/codeobject_ser.c
@@ -370,3 +370,4 @@ char* CodeObject__loads(const void* data, int size, CodeObject* out) {
 #undef CODEOBJECT_MAGIC
 #undef CODEOBJECT_VER_MAJOR
 #undef CODEOBJECT_VER_MINOR
+#undef CODEOBJECT_VER_MINOR_MIN