diff --git a/byte_array.go b/byte_array.go
index a027f95..c52d2d6 100644
--- a/byte_array.go
+++ b/byte_array.go
@@ -52,7 +52,7 @@ func PyByteArray_Size(o *PyObject) int {
 
 //PyByteArray_AsString : https://docs.python.org/3/c-api/bytearray.html#c.PyByteArray_AsString
 func PyByteArray_AsString(o *PyObject) string {
-	return C.GoString(C.PyByteArray_AsString(toc(o)))
+	return C.GoStringN(C.PyByteArray_AsString(toc(o)), C.int(C.PyByteArray_Size(toc(o))))
 }
 
 //PyByteArray_Resize : https://docs.python.org/3/c-api/bytearray.html#c.PyByteArray_Resize
diff --git a/bytes.go b/bytes.go
index 0e91377..1ed45d2 100644
--- a/bytes.go
+++ b/bytes.go
@@ -47,7 +47,7 @@ func PyBytes_Size(o *PyObject) int {
 
 //PyBytes_AsString : https://docs.python.org/3/c-api/bytes.html#c.PyBytes_AsString
 func PyBytes_AsString(o *PyObject) string {
-	return C.GoString(C.PyBytes_AsString(toc(o)))
+	return C.GoStringN(C.PyBytes_AsString(toc(o)), C.int(C.PyBytes_Size(toc(o)))) 
 }
 
 //PyBytes_Concat : https://docs.python.org/3/c-api/bytes.html#c.PyBytes_Concat