diff --git a/array.c b/array.c
index aee8886e12..a6cfd9bd22 100644
--- a/array.c
+++ b/array.c
@@ -880,7 +880,7 @@ rb_ary_free(VALUE ary)
     }
 }
 
-RUBY_FUNC_EXPORTED size_t
+size_t
 rb_ary_memsize(VALUE ary)
 {
     if (ARY_OWNS_HEAP_P(ary)) {
diff --git a/file.c b/file.c
index 718ecaf2a0..2610449b49 100644
--- a/file.c
+++ b/file.c
@@ -2463,7 +2463,7 @@ rb_file_ctime(VALUE obj)
  *
  */
 
-RUBY_FUNC_EXPORTED VALUE
+VALUE
 rb_file_s_birthtime(VALUE klass, VALUE fname)
 {
     statx_data st;
diff --git a/hash.c b/hash.c
index c8fe54eff9..fba394fc40 100644
--- a/hash.c
+++ b/hash.c
@@ -1600,7 +1600,7 @@ rb_hash_modify_check(VALUE hash)
     rb_check_frozen(hash);
 }
 
-RUBY_FUNC_EXPORTED struct st_table *
+struct st_table *
 rb_hash_tbl_raw(VALUE hash, const char *file, int line)
 {
     return ar_force_convert_table(hash, file, line);
diff --git a/io.c b/io.c
index 94e6b50656..b4488170ea 100644
--- a/io.c
+++ b/io.c
@@ -5622,7 +5622,7 @@ rb_io_fptr_finalize(rb_io_t *fptr)
 }
 #define rb_io_fptr_finalize(fptr) rb_io_fptr_finalize_internal(fptr)
 
-RUBY_FUNC_EXPORTED size_t
+size_t
 rb_io_memsize(const rb_io_t *fptr)
 {
     size_t size = sizeof(rb_io_t);
diff --git a/shape.c b/shape.c
index 8d8314db33..06d0f2135d 100644
--- a/shape.c
+++ b/shape.c
@@ -322,7 +322,7 @@ rb_shape_each_shape(each_shape_callback callback, void *data)
     }
 }
 
-RUBY_FUNC_EXPORTED rb_shape_t*
+RUBY_FUNC_EXPORTED rb_shape_t *
 rb_shape_get_shape_by_id(shape_id_t shape_id)
 {
     RUBY_ASSERT(shape_id != INVALID_SHAPE_ID);
diff --git a/shape.h b/shape.h
index 4fc46b4525..60e68dfe9b 100644
--- a/shape.h
+++ b/shape.h
@@ -150,12 +150,12 @@ int32_t rb_shape_id_offset(void);
 
 rb_shape_t * rb_shape_get_parent(rb_shape_t * shape);
 
-rb_shape_t* rb_shape_get_shape_by_id(shape_id_t shape_id);
-shape_id_t rb_shape_get_shape_id(VALUE obj);
+RUBY_FUNC_EXPORTED rb_shape_t *rb_shape_get_shape_by_id(shape_id_t shape_id);
+RUBY_FUNC_EXPORTED shape_id_t rb_shape_get_shape_id(VALUE obj);
 rb_shape_t * rb_shape_get_next_iv_shape(rb_shape_t * shape, ID id);
 bool rb_shape_get_iv_index(rb_shape_t * shape, ID id, attr_index_t * value);
 bool rb_shape_get_iv_index_with_hint(shape_id_t shape_id, ID id, attr_index_t * value, shape_id_t *shape_id_hint);
-bool rb_shape_obj_too_complex(VALUE obj);
+RUBY_FUNC_EXPORTED bool rb_shape_obj_too_complex(VALUE obj);
 
 void rb_shape_set_shape(VALUE obj, rb_shape_t* shape);
 rb_shape_t* rb_shape_get_shape(VALUE obj);
diff --git a/string.c b/string.c
index f8a64fca13..24dd29b32e 100644
--- a/string.c
+++ b/string.c
@@ -1578,7 +1578,7 @@ rb_str_free(VALUE str)
     }
 }
 
-RUBY_FUNC_EXPORTED size_t
+size_t
 rb_str_memsize(VALUE str)
 {
     if (FL_TEST(str, STR_NOEMBED|STR_SHARED|STR_NOFREE) == STR_NOEMBED) {
diff --git a/variable.c b/variable.c
index ab779f7420..564fd643fb 100644
--- a/variable.c
+++ b/variable.c
@@ -1166,7 +1166,7 @@ rb_free_generic_ivar(VALUE obj)
     }
 }
 
-RUBY_FUNC_EXPORTED size_t
+size_t
 rb_generic_ivar_memsize(VALUE obj)
 {
     struct gen_ivtbl *ivtbl;
@@ -2546,7 +2546,7 @@ get_autoload_data(VALUE autoload_const_value, struct autoload_const **autoload_c
     return autoload_data;
 }
 
-RUBY_FUNC_EXPORTED void
+void
 rb_autoload(VALUE module, ID name, const char *feature)
 {
     if (!feature || !*feature) {