diff --git a/source/core/thingdef_data.cpp b/source/core/thingdef_data.cpp
index a7ae41583..3b18ba635 100644
--- a/source/core/thingdef_data.cpp
+++ b/source/core/thingdef_data.cpp
@@ -439,10 +439,6 @@ void InitThingdef()
 		}
 	);
 
-	auto collstruct = NewStruct("Collision", nullptr, true);
-	collstruct->Size = sizeof(CollisionBase);
-	collstruct->Align = alignof(CollisionBase);
-
 
 	auto sidestruct = NewStruct("TSprite", nullptr, true);
 	sidestruct->Size = sizeof(tspritetype);
diff --git a/source/core/vmexports.cpp b/source/core/vmexports.cpp
index 6a683dc89..a07314826 100644
--- a/source/core/vmexports.cpp
+++ b/source/core/vmexports.cpp
@@ -1028,8 +1028,6 @@ DEFINE_ACTION_FUNCTION_NATIVE(DCoreActor, spritetexture, CoreActor_spritetexture
 
 
 
-DEFINE_FIELD_X(Collision, CollisionBase, type)
-DEFINE_FIELD_X(Collision, CollisionBase, exbits)
 
 walltype* collision_getwall(CollisionBase* coll)
 {