diff --git a/src/cache.c3 b/src/cache.c3
index f6c523b..aeca415 100644
--- a/src/cache.c3
+++ b/src/cache.c3
@@ -96,8 +96,7 @@ fn void Cache.remove(&cache, Key id)
 /* If there is no free space left then just return the first position */
 fn usz Cache.get_free_spot(&cache)
 {
-	// TODO: in the upgrade to c3 1.7.5 use @bitsof()
-	const BITS = $typeof(cache.present.data[0]).sizeof*8;
+	const BITS = @bitsizeof(cache.present.data[0]);
 	foreach (idx, d: cache.present.data) {
 		if (d != $typeof(d).max) {
 			usz spot = idx*BITS + BITS-d.clz();