diff --git a/vlib/compiler/main.v b/vlib/compiler/main.v
index 0754b2c021..f56c445b24 100644
--- a/vlib/compiler/main.v
+++ b/vlib/compiler/main.v
@@ -9,7 +9,7 @@ import (
 	strings
 )
 
-const (
+pub const (
 	Version = '0.1.21'
 )
 
diff --git a/vlib/compiler/parser.v b/vlib/compiler/parser.v
index e1a8d5d729..29f9355252 100644
--- a/vlib/compiler/parser.v
+++ b/vlib/compiler/parser.v
@@ -1850,7 +1850,7 @@ fn (p mut Parser) name_expr() string {
 		return p.get_const_type(name, ptr)
 	}
 
-	// Function (not method btw, methods are handled in dot())	
+	// Function (not method, methods are handled in `.dot()`)	
 	mut f := p.table.find_fn_is_script(name, p.v_script) or {
 		return p.get_undefined_fn_type(name, orig_name)
 	}
@@ -1964,6 +1964,9 @@ fn (p mut Parser) get_const_type(name string, is_ptr bool) string {
 		// c.ptr = true
 		p.gen('& /*const*/ ')
 	}
+	if !c.is_public && c.mod != p.mod {
+		p.warn('constant `$c.name` is private')
+	}	
 	mut typ := p.var_expr(c)
 	if is_ptr {
 		typ += '*'
diff --git a/vlib/compiler/vhelp.v b/vlib/compiler/vhelp.v
index 6eab8dc506..27c9cd7f14 100644
--- a/vlib/compiler/vhelp.v
+++ b/vlib/compiler/vhelp.v
@@ -1,6 +1,6 @@
 module compiler
 
-const (
+pub const (
 	help_text = 'Usage: v [options/commands] [file.v | directory]
 
    When V is run without any arguments, it is run in REPL mode.
diff --git a/vlib/os/os.v b/vlib/os/os.v
index f866fe0487..8835b54d0b 100644
--- a/vlib/os/os.v
+++ b/vlib/os/os.v
@@ -26,7 +26,7 @@ struct C.dirent {
 
 fn C.readdir(voidptr) C.dirent
 
-const (
+pub const (
 	args = []string
 	MAX_PATH = 4096
 )
diff --git a/vlib/os/os_nix.v b/vlib/os/os_nix.v
index 4abce85b37..4bae3d3361 100644
--- a/vlib/os/os_nix.v
+++ b/vlib/os/os_nix.v
@@ -3,7 +3,7 @@ module os
 #include <dirent.h>
 #include <unistd.h>
 
-const (
+pub const (
 	path_separator = '/'
 )
 
diff --git a/vlib/os/os_windows.v b/vlib/os/os_windows.v
index 36348c5762..032a0d97e5 100644
--- a/vlib/os/os_windows.v
+++ b/vlib/os/os_windows.v
@@ -3,7 +3,7 @@ module os
 #flag -lws2_32
 #include <winsock2.h>
 
-const (
+pub const (
 	path_separator = '\\'
 )