diff --git a/vlib/os/os_stat_windows.c.v b/vlib/os/os_stat_windows.c.v
index 5d2d81512f..8b1900ad2b 100644
--- a/vlib/os/os_stat_windows.c.v
+++ b/vlib/os/os_stat_windows.c.v
@@ -139,12 +139,12 @@ fn windows_dangling_symlink_stat(path string) ?Stat {
 }
 
 fn windows_stat_from_find_data(path string, find_data Win32finddata) Stat {
-	mut mode := u32(C.S_IFREG) | u32(C.S_IREAD)
+	mut mode := u32(s_ifreg) | u32(s_irusr)
 	if find_data.dw_file_attributes & u32(C.FILE_ATTRIBUTE_READONLY) == 0 {
-		mode |= u32(C.S_IWRITE)
+		mode |= u32(s_iwusr)
 	}
 	match file_ext(path).to_lower() {
-		'.exe', '.com', '.bat', '.cmd' { mode |= u32(C.S_IEXEC) }
+		'.exe', '.com', '.bat', '.cmd' { mode |= u32(s_ixusr) }
 		else {}
 	}
 	return Stat{
@@ -167,8 +167,8 @@ fn windows_filetime_to_unix_seconds(filetime Filetime) i64 {
 
 // get_filetype returns the FileType from the Stat struct.
 pub fn (st Stat) get_filetype() FileType {
-	match st.mode & u32(C.S_IFMT) {
-		u32(C.S_IFDIR) {
+	match st.mode & u32(s_ifmt) {
+		u32(s_ifdir) {
 			return .directory
 		}
 		else {
@@ -183,19 +183,19 @@ pub fn (st Stat) get_mode() FileMode {
 	return FileMode{
 		typ:    st.get_filetype()
 		owner:  FilePermission{
-			read:    (st.mode & u32(C.S_IREAD)) != 0
-			write:   (st.mode & u32(C.S_IWRITE)) != 0
-			execute: (st.mode & u32(C.S_IEXEC)) != 0
+			read:    (st.mode & u32(s_irusr)) != 0
+			write:   (st.mode & u32(s_iwusr)) != 0
+			execute: (st.mode & u32(s_ixusr)) != 0
 		}
 		group:  FilePermission{
-			read:    (st.mode & u32(C.S_IREAD)) != 0
-			write:   (st.mode & u32(C.S_IWRITE)) != 0
-			execute: (st.mode & u32(C.S_IEXEC)) != 0
+			read:    (st.mode & u32(s_irusr)) != 0
+			write:   (st.mode & u32(s_iwusr)) != 0
+			execute: (st.mode & u32(s_ixusr)) != 0
 		}
 		others: FilePermission{
-			read:    (st.mode & u32(C.S_IREAD)) != 0
-			write:   (st.mode & u32(C.S_IWRITE)) != 0
-			execute: (st.mode & u32(C.S_IEXEC)) != 0
+			read:    (st.mode & u32(s_irusr)) != 0
+			write:   (st.mode & u32(s_iwusr)) != 0
+			execute: (st.mode & u32(s_ixusr)) != 0
 		}
 	}
 }
diff --git a/vlib/os/os_stat_windows_test.v b/vlib/os/os_stat_windows_test.v
index 0e5e673a46..7df0ae216b 100644
--- a/vlib/os/os_stat_windows_test.v
+++ b/vlib/os/os_stat_windows_test.v
@@ -36,9 +36,9 @@ fn test_windows_stat_from_find_data() {
 
 	assert link_stat.get_filetype() == .regular
 	assert link_stat.nlink == 1
-	assert link_stat.mode & u32(C.S_IREAD) != 0
-	assert link_stat.mode & u32(C.S_IWRITE) != 0
-	assert link_stat.mode & u32(C.S_IEXEC) != 0
+	assert link_stat.mode & u32(s_irusr) != 0
+	assert link_stat.mode & u32(s_iwusr) != 0
+	assert link_stat.mode & u32(s_ixusr) != 0
 	assert link_stat.size == (u64(1) << 32) | 7
 	assert link_stat.atime == -1
 	assert link_stat.mtime == 0
@@ -46,15 +46,15 @@ fn test_windows_stat_from_find_data() {
 
 	for extension in ['EXE', 'COM', 'BAT', 'CMD'] {
 		executable_stat := windows_stat_from_find_data('dangling.${extension}', find_data)
-		assert executable_stat.mode & u32(C.S_IEXEC) != 0
+		assert executable_stat.mode & u32(s_ixusr) != 0
 	}
 
 	mut read_only_data := find_data
 	read_only_data.dw_file_attributes = u32(C.FILE_ATTRIBUTE_READONLY)
 	read_only_stat := windows_stat_from_find_data('dangling.TXT', read_only_data)
-	assert read_only_stat.mode & u32(C.S_IREAD) != 0
-	assert read_only_stat.mode & u32(C.S_IWRITE) == 0
-	assert read_only_stat.mode & u32(C.S_IEXEC) == 0
+	assert read_only_stat.mode & u32(s_irusr) != 0
+	assert read_only_stat.mode & u32(s_iwusr) == 0
+	assert read_only_stat.mode & u32(s_ixusr) == 0
 }
 
 fn test_windows_get_mode_maps_stat_bits_to_file_mode() {
diff --git a/vlib/os/os_windows.c.v b/vlib/os/os_windows.c.v
index 1a57e08182..0ade6a378f 100644
--- a/vlib/os/os_windows.c.v
+++ b/vlib/os/os_windows.c.v
@@ -35,7 +35,7 @@ fn C._getpid() i32
 // cmd.exe uses when two programs differ only by extension.
 const executable_suffixes = ['.com', '.exe', '.bat', '.cmd', '']
 
-// these consts are declared for parity with the nix version, their values are not used, except for -cross
+// Windows CRT file type and permission bits, also exposed for parity with Unix.
 const s_ifmt = 0xF000 // type of file
 const s_ifdir = 0x4000 // directory
 const s_ifreg = 0x8000 // regular file