diff --git a/vlib/os/os.v b/vlib/os/os.v
index 4a293ea8ac..076a590740 100644
--- a/vlib/os/os.v
+++ b/vlib/os/os.v
@@ -407,7 +407,7 @@ fn posix_wait4_to_exit_status(waitret int) (int,bool) {
 
 fn vpclose(f voidptr) int {
 	$if windows {
-		return int( C._pclose(f) )
+		return C._pclose(f)
 	}
 	$else {
 		ret , _ := posix_wait4_to_exit_status(C.pclose(f))
@@ -779,7 +779,7 @@ pub fn executable() string {
 	$if windows {
 		max := 512
 		mut result := &u16(calloc(max*2)) // MAX_PATH * sizeof(wchar_t)
-		len := int(C.GetModuleFileName( 0, result, max ))
+		len := C.GetModuleFileName( 0, result, max )
 		return string_from_wide2(result, len)
 	}
 	$if macos {
diff --git a/vlib/os/os_windows.v b/vlib/os/os_windows.v
index 69ef881d92..9da24bf0bf 100644
--- a/vlib/os/os_windows.v
+++ b/vlib/os/os_windows.v
@@ -78,7 +78,7 @@ fn init_os_args(argc int, argv &byteptr) []string {
 	mut args := []string
 	mut args_list := &voidptr(0)
 	mut args_count := 0
-	args_list = &voidptr(C.CommandLineToArgvW(C.GetCommandLine(), &args_count))
+	args_list = C.CommandLineToArgvW(C.GetCommandLine(), &args_count)
 	for i := 0; i < args_count; i++ {
 		args << string_from_wide(&u16(args_list[i]))
 	}
@@ -160,7 +160,7 @@ pub fn get_file_handle(path string) HANDLE {
 // get_module_filename retrieves the fully qualified path for the file that contains the specified module.
 // The module must have been loaded by the current process.
 pub fn get_module_filename(handle HANDLE) ?string {
-    mut sz := int(4096) // Optimized length
+    mut sz := 4096 // Optimized length
     mut buf := &u16(malloc(4096))
     for {
         status := int(C.GetModuleFileNameW(handle, voidptr(&buf), sz))