diff --git a/src/apng.rs b/src/apng.rs
index 6199fa54..d6505eeb 100644
--- a/src/apng.rs
+++ b/src/apng.rs
@@ -68,8 +68,8 @@ impl Frame {
     #[must_use]
     pub fn fdat_data(&self, sequence_number: u32) -> Vec<u8> {
         let mut byte_data = Vec::with_capacity(4 + self.data.len());
-        byte_data.write_all(&sequence_number.to_be_bytes()).unwrap();
-        byte_data.write_all(&self.data).unwrap();
+        byte_data.extend_from_slice(&sequence_number.to_be_bytes());
+        byte_data.extend_from_slice(&self.data);
         byte_data
     }
 }