diff --git a/vlib/os/os.c.v b/vlib/os/os.c.v
index 03d7846b0b..a2bef3f227 100644
--- a/vlib/os/os.c.v
+++ b/vlib/os/os.c.v
@@ -527,7 +527,7 @@ pub fn get_raw_line() string {
 		unsafe {
 			initial_size := 256 * wide_char_size
 			mut buf := malloc_noscan(initial_size)
-			defer { buf.free() }
+			defer { unsafe { buf.free() } }
 			mut capacity := initial_size
 			mut offset := 0