diff --git a/tools/modules/c_struct.py b/tools/modules/c_struct.py
index e75db6d..a019fce 100644
--- a/tools/modules/c_struct.py
+++ b/tools/modules/c_struct.py
@@ -466,7 +466,7 @@
         assert(len(new_binaries) < 2)
 
         if new_binaries:
-            self._actual_value = list(new_binaries)[0]
+            self._actual_value = new_binaries[0] + self._actual_value[len(new_binaries[0]):]
 
         for f in self._fields:
             f.set_value_from_bytes(self._actual_value[:f._size])