diff --git a/tools/modules/struct_pack.py b/tools/modules/struct_pack.py
index d701eb1..5caa58b 100644
--- a/tools/modules/struct_pack.py
+++ b/tools/modules/struct_pack.py
@@ -18,6 +18,6 @@
     size = struct.calcsize(defstring)
     if size < pad_to:
         defstring += str(pad_to - size) + "x"
-    assert size < pad_to or pad_to == 0, "Error padding struct of size {} to {}".format(size, pad_to)
+    assert size <= pad_to or pad_to == 0, "Error padding struct of size {} to {}".format(size, pad_to)
 
     return (bytes(struct.pack(defstring, *objects)))