diff --git a/src/bitstruct/c.c b/src/bitstruct/c.c
index 0ab2ed0..4ec7493 100644
--- a/src/bitstruct/c.c
+++ b/src/bitstruct/c.c
@@ -430,11 +430,11 @@ static void pack_float_16(struct bitstream_writer_t *self_p,
 #if PY_VERSION_HEX >= 0x030B00A7
     PyFloat_Pack2(PyFloat_AsDouble(value_p),
                   (char*)&buf[0],
-                  PY_BIG_ENDIAN);
+                  0);
 #else
     _PyFloat_Pack2(PyFloat_AsDouble(value_p),
                    &buf[0],
-                   PY_BIG_ENDIAN);
+                   0);
 #endif
     bitstream_writer_write_bytes(self_p, &buf[0], sizeof(buf));
 }
@@ -447,9 +447,9 @@ static PyObject *unpack_float_16(struct bitstream_reader_t *self_p,
 
     bitstream_reader_read_bytes(self_p, &buf[0], sizeof(buf));
 #if PY_VERSION_HEX >= 0x030B00A7
-    value = PyFloat_Unpack2((const char*)&buf[0], PY_BIG_ENDIAN);
+    value = PyFloat_Unpack2((const char*)&buf[0], 0);
 #else
-    value = _PyFloat_Unpack2(&buf[0], PY_BIG_ENDIAN);
+    value = _PyFloat_Unpack2(&buf[0], 0);
 #endif
 
     return (PyFloat_FromDouble(value));