diff --git a/compiler/parser.v b/compiler/parser.v
index 33264172aa..9a079a3b1e 100644
--- a/compiler/parser.v
+++ b/compiler/parser.v
@@ -518,9 +518,9 @@ fn (p mut Parser) const_decl() {
 			continue
 		}
 		mut name := p.check_name()		// `Age = 20`
-		//if ! (name[0] >= `A` && name[0] <= `Z`) {
-			//p.error('const name must be capitalized')
-		//}
+		if p.mod != 'os' && contains_capital(name) {
+			//p.warn('const names cannot contain uppercase letters, use snake_case instead')
+		}
 		name = p.prepend_mod(name)
 		mut typ := ''
 		if p.is_vh {
diff --git a/vlib/os/os_nix.v b/vlib/os/os_nix.v
index 67d4ddda87..e2c5374418 100644
--- a/vlib/os/os_nix.v
+++ b/vlib/os/os_nix.v
@@ -5,6 +5,7 @@ module os
 
 const (
 	PathSeparator = '/'
+	path_separator = '/'
 )
 
 fn init_os_args(argc int, argv &byteptr) []string {
diff --git a/vlib/os/os_win.v b/vlib/os/os_win.v
index 4128832a2a..0da2514b1c 100644
--- a/vlib/os/os_win.v
+++ b/vlib/os/os_win.v
@@ -5,6 +5,7 @@ module os
 
 const (
 	PathSeparator = '\\'
+	path_separator = '\\'
 )
 
 // Ref - https://docs.microsoft.com/en-us/windows/desktop/winprog/windows-data-types