diff --git a/ext/pathname/pathname.c b/ext/pathname/pathname.c
index 995c96ae07..7c24598759 100644
--- a/ext/pathname/pathname.c
+++ b/ext/pathname/pathname.c
@@ -440,6 +440,7 @@ path_atime(VALUE self)
     return rb_funcall(rb_cFile, rb_intern("atime"), 1, get_strpath(self));
 }
 
+#if defined(HAVE_STRUCT_STAT_ST_BIRTHTIMESPEC) || defined(_WIN32)
 /*
  * call-seq:
  *   pathname.birthtime	-> time
@@ -449,7 +450,6 @@ path_atime(VALUE self)
  *
  * See File.birthtime.
  */
-#if defined(HAVE_STRUCT_STAT_ST_BIRTHTIMESPEC) || defined(_WIN32)
 static VALUE
 path_birthtime(VALUE self)
 {
diff --git a/file.c b/file.c
index 196efbbba3..bd6ced5c20 100644
--- a/file.c
+++ b/file.c
@@ -849,6 +849,7 @@ rb_stat_ctime(VALUE self)
     return stat_ctime(get_stat(self));
 }
 
+#if defined(HAVE_STAT_BIRTHTIME)
 /*
  *  call-seq:
  *     stat.birthtime  ->  aTime
@@ -870,7 +871,6 @@ rb_stat_ctime(VALUE self)
  *
  */
 
-#if defined(HAVE_STAT_BIRTHTIME)
 static VALUE
 rb_stat_birthtime(VALUE self)
 {
@@ -2131,6 +2131,7 @@ rb_file_ctime(VALUE obj)
     return stat_ctime(&st);
 }
 
+#if defined(HAVE_STAT_BIRTHTIME)
 /*
  *  call-seq:
  *     File.birthtime(file_name)  -> time
@@ -2145,7 +2146,6 @@ rb_file_ctime(VALUE obj)
  *
  */
 
-#if defined(HAVE_STAT_BIRTHTIME)
 static VALUE
 rb_file_s_birthtime(VALUE klass, VALUE fname)
 {
@@ -2161,6 +2161,7 @@ rb_file_s_birthtime(VALUE klass, VALUE fname)
 # define rb_file_s_birthtime rb_f_notimplement
 #endif
 
+#if defined(HAVE_STAT_BIRTHTIME)
 /*
  *  call-seq:
  *     file.birthtime  ->  time
@@ -2173,7 +2174,6 @@ rb_file_s_birthtime(VALUE klass, VALUE fname)
  *
  */
 
-#if defined(HAVE_STAT_BIRTHTIME)
 static VALUE
 rb_file_birthtime(VALUE obj)
 {