diff --git a/vlib/builtin/builtin_windows.c.v b/vlib/builtin/builtin_windows.c.v
index 3cd3d6350d..333282c105 100644
--- a/vlib/builtin/builtin_windows.c.v
+++ b/vlib/builtin/builtin_windows.c.v
@@ -267,6 +267,7 @@ fn break_if_debugger_attached() {
 		unsafe {
 			mut ptr := &voidptr(0)
 			*ptr = voidptr(0)
+			_ = ptr
 		}
 	} $else {
 		if C.IsDebuggerPresent() {