diff --git a/Cargo.toml b/Cargo.toml
index 1da3582..d45766e 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -28,7 +28,7 @@ serde = { version = "1", default-features = false, features = ["derive"] }
 serde_bytes = "0.11.12"
 
 [features]
-heapless-bytes-v0-3 = ["dep:heapless-bytes-v0-3"]
+heapless-bytes-v0-3 = ["dep:heapless-bytes-v0-3", "heapless-v0-7"]
 heapless-bytes-v0-4 = ["dep:heapless-bytes-v0-4"]
 heapless-v0-7 = ["dep:heapless-v0-7"]
 heapless-v0-8 = ["dep:heapless-v0-8"]
diff --git a/src/lib.rs b/src/lib.rs
index d269473..45b0c6b 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -41,7 +41,8 @@ pub fn cbor_serialize_extending_bytes<T: ?Sized + serde::Serialize, const N: usi
     bytes: &mut heapless_bytes_v0_3::Bytes<N>,
 ) -> Result<usize> {
     let len_before = bytes.len();
-    let mut ser = ser::Serializer::new(bytes);
+    let vec: &mut heapless_v0_7::Vec<u8, N> = bytes;
+    let mut ser = ser::Serializer::new(vec);
 
     object.serialize(&mut ser)?;