diff --git a/eo-runtime/src/main/rust/eo_env/src/eo_env.rs b/eo-runtime/src/main/rust/eo_env/src/eo_env.rs
index 00e57d6632..dbd98fe28a 100644
--- a/eo-runtime/src/main/rust/eo_env/src/eo_env.rs
+++ b/eo-runtime/src/main/rust/eo_env/src/eo_env.rs
@@ -98,7 +98,7 @@ impl<'local> EOEnv<'_> {
         }
     }
 
-    pub fn dataize(&mut self, v: u32) -> Option<Vec<i8>> {
+    pub fn dataize(&mut self, v: u32) -> Option<Vec<u8>> {
         let java_array = JByteArray::from(
             self.java_env
             .call_method(
@@ -114,6 +114,7 @@ impl<'local> EOEnv<'_> {
         if self.java_env.get_byte_array_region(&java_array, 0, &mut bytes[0..]).is_err() {
             return None;
         }
-        return Some(bytes);
+        let unsigned = unsafe { &*(&bytes[0..] as *const _  as *const [u8]) };
+        return Some(unsigned.to_vec());
     }
 }
diff --git a/eo-runtime/src/test/eo/org/eolang/rust-tests.eo b/eo-runtime/src/test/eo/org/eolang/rust-tests.eo
index a4280d6741..3dca7a2a62 100644
--- a/eo-runtime/src/test/eo/org/eolang/rust-tests.eo
+++ b/eo-runtime/src/test/eo/org/eolang/rust-tests.eo
@@ -237,15 +237,12 @@
 
     pub fn foo(env: &mut EOEnv) -> EO {
       let a = env.find("$.^.a") as u32;
-      let b = env.find("$.^.b") as u32;
       let bytes_a = env.dataize(a).unwrap();
-      let mut arr_a = unsafe { &*(&bytes_a[0..] as *const _  as *const [u8]) };
+      let a = bytes_a.as_slice().read_i64::<BigEndian>().unwrap();
 
+      let b = env.find("$.^.b") as u32;
       let bytes_b = env.dataize(b).unwrap();
-      let mut arr_b = unsafe { &*(&bytes_b[0..] as *const _  as *const [u8]) };
-
-      let a = arr_a.read_i64::<BigEndian>().unwrap();
-      let b = arr_b.read_i64::<BigEndian>().unwrap();
+      let b = bytes_b.as_slice().read_i64::<BigEndian>().unwrap();
       println!("sum 5 + 10 = {}", a + b);
 
       EOInt(a + b)