diff --git a/LEGO1/lego/legoomni/src/entity/legonavcontroller.cpp b/LEGO1/lego/legoomni/src/entity/legonavcontroller.cpp
index e1cf73dd..7a6ad696 100644
--- a/LEGO1/lego/legoomni/src/entity/legonavcontroller.cpp
+++ b/LEGO1/lego/legoomni/src/entity/legonavcontroller.cpp
@@ -9,6 +9,8 @@
 
 #include <vec.h>
 
+DECOMP_SIZE_ASSERT(LegoNavController, 0x70)
+
 //////////////////////////////////////////////////////////////////////
 
 #ifndef M_PI