diff --git a/code/AssbinExporter.cpp b/code/AssbinExporter.cpp
index 6bee6d6d1..bcac2e08f 100644
--- a/code/AssbinExporter.cpp
+++ b/code/AssbinExporter.cpp
@@ -171,6 +171,7 @@ inline size_t Write<aiQuaternion>(IOStream * stream, const aiQuaternion& v)
     t += Write<float>(stream,v.x);
     t += Write<float>(stream,v.y);
     t += Write<float>(stream,v.z);
+    ai_assert(t == 16);
     return 16;
 }