diff --git a/vlib/os/os.v b/vlib/os/os.v
index d2b935dac4..f011bb2ebc 100644
--- a/vlib/os/os.v
+++ b/vlib/os/os.v
@@ -199,7 +199,7 @@ pub fn dir(opath string) string {
 	if opath == '' {
 		return '.'
 	}
-	path := opath.replace_each(['/', path_separator, r'\', path_separator])
+	path := opath.replace_each(['/', path_separator, '\\', path_separator])
 	pos := path.last_index(path_separator) or { return '.' }
 	if pos == 0 && path_separator == '/' {
 		return '/'
@@ -215,7 +215,7 @@ pub fn base(opath string) string {
 	if opath == '' {
 		return '.'
 	}
-	path := opath.replace_each(['/', path_separator, r'\', path_separator])
+	path := opath.replace_each(['/', path_separator, '\\', path_separator])
 	if path == path_separator {
 		return path_separator
 	}
@@ -231,7 +231,7 @@ pub fn base(opath string) string {
 // file_name will return all characters found after the last occurence of `path_separator`.
 // file extension is included.
 pub fn file_name(opath string) string {
-	path := opath.replace_each(['/', path_separator, r'\', path_separator])
+	path := opath.replace_each(['/', path_separator, '\\', path_separator])
 	return path.all_after_last(path_separator)
 }
 
@@ -431,7 +431,7 @@ fn executable_fallback() string {
 		}
 	}
 	if !is_abs_path(exepath) {
-		rexepath := exepath.replace_each(['/', path_separator, r'\', path_separator])
+		rexepath := exepath.replace_each(['/', path_separator, '\\', path_separator])
 		if rexepath.contains(path_separator) {
 			exepath = join_path_single(os.wd_at_startup, exepath)
 		} else {