diff --git a/lang/rust/avro/src/de.rs b/lang/rust/avro/src/de.rs
index 33cd5af9c1f..b354d042b77 100644
--- a/lang/rust/avro/src/de.rs
+++ b/lang/rust/avro/src/de.rs
@@ -668,6 +668,8 @@ mod tests {
     use serde::{Deserialize, Serialize};
     use serial_test::serial;
     use std::sync::atomic::Ordering;
+    use serde::Serialize;
+    use serde_bytes::ByteArray;
     use uuid::Uuid;
 
     use apache_avro_test_helper::TestResult;
@@ -1554,7 +1556,7 @@ mod tests {
     fn test_avro_3631_struct_fixed_field() {
         #[derive(Debug, Serialize, Deserialize)]
         struct TestStructFixedField {
-            field: [u8; 6],
+            field: ByteArray<6>,
         }
 
         let value = Value::Record(vec![(
@@ -1562,6 +1564,5 @@ mod tests {
             Value::Fixed(6, vec![0, 0, 0, 0, 0, 0]),
         )]);
         let _deserialized: TestStructFixedField = from_value(&value).unwrap();
-
     }
 }
diff --git a/lang/rust/avro/src/ser.rs b/lang/rust/avro/src/ser.rs
index aa033f7b6ee..714a43c45ab 100644
--- a/lang/rust/avro/src/ser.rs
+++ b/lang/rust/avro/src/ser.rs
@@ -174,7 +174,7 @@ impl<'b> ser::Serializer for &'b mut Serializer {
     }
 
     fn serialize_bytes(self, v: &[u8]) -> Result<Self::Ok, Self::Error> {
-        Ok(Value::Bytes(v.to_owned()))
+        Ok(Value::Fixed(v.len(), v.to_owned()))
     }
 
     fn serialize_none(self) -> Result<Self::Ok, Self::Error> {
@@ -486,6 +486,7 @@ mod tests {
     use serde::{Deserialize, Serialize};
     use serial_test::serial;
     use std::sync::atomic::Ordering;
+    use serde_bytes::ByteArray;
 
     #[derive(Debug, Deserialize, Serialize, Clone)]
     struct Test {
@@ -678,7 +679,7 @@ mod tests {
 
     #[derive(Debug, Serialize, Deserialize)]
     struct TestStructFixedField {
-        field: [u8; 6],
+        field: ByteArray<6>,
     }
 
     #[test]
@@ -1038,15 +1039,17 @@ mod tests {
     }
 
     #[test]
-    fn test_to_value_fixed_field_avro_3631() {
-        let test = TestStructFixedField { field: [1; 6] };
+    fn avro_3631_test_to_value_fixed_field() {
+        let test = TestStructFixedField {
+            field: ByteArray::new([1; 6]),
+        };
         let expected = Value::Record(vec![(
             "field".to_owned(),
-            Value::Fixed(6, Vec::from(test.field.clone())),
+            Value::Fixed(6, Vec::from(test.field.clone().into_array())),
         )]);
         assert_eq!(
-            to_value(test).unwrap(),
             expected,
+            to_value(test).unwrap(),
             "error serializing fixed array"
         );
     }
diff --git a/lang/rust/avro/src/types.rs b/lang/rust/avro/src/types.rs
index 4744cf55c42..2af12e30a29 100644
--- a/lang/rust/avro/src/types.rs
+++ b/lang/rust/avro/src/types.rs
@@ -1167,6 +1167,7 @@ mod tests {
     use pretty_assertions::assert_eq;
     use serde::{Deserialize, Serialize};
     use serde_json::json;
+    use serde_bytes::ByteArray;
     use uuid::Uuid;
 
     #[test]
@@ -3123,14 +3124,16 @@ Field with name '"b"' is not a member of the map items"#,
         );
     }
 
-    #[derive(Debug, Serialize, Deserialize)]
-    struct TestStructFixedField {
-        field: [u8; 6],
-    }
-
     #[test]
-    fn test_avro_3631_serialize_fixed_fields() {
-        let test = TestStructFixedField { field: [1; 6] };
+    fn avro_3631_test_serialize_fixed_fields() {
+        #[derive(Debug, Serialize, Deserialize)]
+        struct TestStructFixedField {
+            field: ByteArray<6>,
+        }
+
+        let test = TestStructFixedField {
+            field: ByteArray::new([1; 6]),
+        };
         let value: Value = to_value(test).unwrap();
         let schema = Schema::parse_str(
             r#"