diff --git a/Cargo.toml b/Cargo.toml
index dedc601..d580d7c 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "fimg"
-version = "0.4.16"
+version = "0.4.17"
 authors = ["bend-n <bend.n@outlook.com>"]
 license = "MIT"
 edition = "2021"
diff --git a/src/builder.rs b/src/builder.rs
index 9133e36..bff5e7c 100644
--- a/src/builder.rs
+++ b/src/builder.rs
@@ -98,4 +98,14 @@ mod buf {
             N
         }
     }
+    impl<T, const N: usize> Buffer for Box<[T; N]> {
+        fn len(&self) -> usize {
+            N
+        }
+    }
+    impl<T> Buffer for Box<[T]> {
+        fn len(&self) -> usize {
+            <[T]>::len(self)
+        }
+    }
 }