diff --git a/lib/std/io/formatter.c3 b/lib/std/io/formatter.c3
index f66882057..fe4f1c76d 100644
--- a/lib/std/io/formatter.c3
+++ b/lib/std/io/formatter.c3
@@ -28,7 +28,8 @@ macro bool is_struct_with_default_print($Type)
 {
 	return $Type.kindof == STRUCT
 		&&& !$defined($Type.to_format)
-		&&& !$defined($Type.to_new_string);
+		&&& !$defined($Type.to_new_string)
+		&&& !$defined($Type.to_string);
 }
 
 <*
@@ -529,4 +530,4 @@ fn usz! Formatter.print(&self, String str)
 	}
 	foreach (c : str) self.out(c)!;
 	return self.idx;
-}
\ No newline at end of file
+}