diff --git a/vlib/builtin/builtin_nix.c.v b/vlib/builtin/builtin_nix.c.v
index 0fa2404809..64c664825b 100644
--- a/vlib/builtin/builtin_nix.c.v
+++ b/vlib/builtin/builtin_nix.c.v
@@ -55,7 +55,7 @@ fn print_backtrace_skipping_top_frames(xskipframes int) bool {
 	$if openbsd {
 		return print_backtrace_skipping_top_frames_freebsd(skipframes)
 	}
-	println('print_backtrace_skipping_top_frames is not implemented')
+	println('print_backtrace_skipping_top_frames is not implemented. skipframes: $skipframes')
 	return false
 }