diff --git a/python4j/python4j-core/src/main/java/org/nd4j/python4j/PythonTypes.java b/python4j/python4j-core/src/main/java/org/nd4j/python4j/PythonTypes.java
index 089c8aefe..d23c70dde 100644
--- a/python4j/python4j-core/src/main/java/org/nd4j/python4j/PythonTypes.java
+++ b/python4j/python4j-core/src/main/java/org/nd4j/python4j/PythonTypes.java
@@ -258,7 +258,7 @@ public class PythonTypes {
                     return ret;
                 }else if (javaObject instanceof byte[]){
                     byte[] arr = (byte[]) javaObject;
-                    for (int x : arr) ret.add(x);
+                    for (int x : arr) ret.add(x & 0xff);
                     return ret;
                 } else if (javaObject instanceof long[]) {
                     long[] arr = (long[]) javaObject;
diff --git a/python4j/python4j-core/src/test/java/PythonPrimitiveTypesTest.java b/python4j/python4j-core/src/test/java/PythonPrimitiveTypesTest.java
index 94423f7de..5080b8b35 100644
--- a/python4j/python4j-core/src/test/java/PythonPrimitiveTypesTest.java
+++ b/python4j/python4j-core/src/test/java/PythonPrimitiveTypesTest.java
@@ -81,16 +81,31 @@ public class PythonPrimitiveTypesTest {
     }
     @Test
     public void testBytes() {
+        byte[] bytes = new byte[256];
+        for (int i = 0; i < 256; i++) {
+            bytes[i] = (byte) i;
+        }
+        List<PythonVariable> inputs = new ArrayList<>();
+        inputs.add(new PythonVariable<>("b1", PythonTypes.BYTES, bytes));
+        List<PythonVariable> outputs = new ArrayList<>();
+        outputs.add(new PythonVariable<>("b2", PythonTypes.BYTES));
+        String code = "b2=b1";
+        PythonExecutioner.exec(code, inputs, outputs);
+        Assert.assertArrayEquals(bytes, (byte[]) outputs.get(0).getValue());
+    }
+
+    @Test
+    public void testBytes2() {
         byte[] bytes = new byte[]{97, 98, 99};
         List<PythonVariable> inputs = new ArrayList<>();
-        inputs.add(new PythonVariable<>("buff", PythonTypes.BYTES, bytes));
+        inputs.add(new PythonVariable<>("b1", PythonTypes.BYTES, bytes));
         List<PythonVariable> outputs = new ArrayList<>();
         outputs.add(new PythonVariable<>("s1", PythonTypes.STR));
-        outputs.add(new PythonVariable<>("buff2", PythonTypes.BYTES));
-        String code = "s1 = ''.join(chr(c) for c in buff)\nbuff2=b'def'";
+        outputs.add(new PythonVariable<>("b2", PythonTypes.BYTES));
+        String code = "s1 = ''.join(chr(c) for c in b1)\nb2=b'def'";
         PythonExecutioner.exec(code, inputs, outputs);
         Assert.assertEquals("abc", outputs.get(0).getValue());
-        Assert.assertArrayEquals(new byte[]{100, 101, 102}, (byte[])outputs.get(1).getValue());
+        Assert.assertArrayEquals(new byte[]{100, 101, 102}, (byte[]) outputs.get(1).getValue());
     }
 
 }