diff --git a/internal/unsafe/unsafe.go b/internal/unsafe/unsafe.go
index 3e963777..4687ca61 100644
--- a/internal/unsafe/unsafe.go
+++ b/internal/unsafe/unsafe.go
@@ -41,6 +41,7 @@ func SliceOf(s uintptr) []byte {
 	h := (*reflect.SliceHeader)(unsafe.Pointer(&res))
 	h.Data = s
 	h.Cap = 1 << 30
+	h.Len = 1 << 30
 	return res
 }