diff --git a/src/zscript/vm.h b/src/zscript/vm.h
index f92906fd2..5b37aa47c 100644
--- a/src/zscript/vm.h
+++ b/src/zscript/vm.h
@@ -900,7 +900,7 @@ void VMDisasm(FILE *out, const VMOP *code, int codesize, const VMScriptFunction
 #define PARAM_STATE_AT(p,x)			assert((p) < numparam); assert(param[p].Type == REGT_POINTER && (param[p].atag == ATAG_STATE || param[p].a == NULL)); FState *x = (FState *)param[p].a;
 #define PARAM_POINTER_AT(p,x,type)	assert((p) < numparam); assert(param[p].Type == REGT_POINTER); type *x = (type *)param[p].a;
 #define PARAM_OBJECT_AT(p,x,type)	assert((p) < numparam); assert(param[p].Type == REGT_POINTER && (param[p].atag == ATAG_OBJECT || param[p].a == NULL)); type *x = (type *)param[p].a; assert(x == NULL || x->IsKindOf(RUNTIME_CLASS(type)));
-#define PARAM_CLASS_AT(p,x,base)	assert((p) < numparam); assert(param[p].Type == REGT_POINTER && (param[p].atag == ATAG_OBJECT || param[p].a == NULL)); base::MetaClass *x = (base::MetaClass *)param[p].a; assert(x != NULL && x->IsDescendantOf(RUNTIME_CLASS(base)));
+#define PARAM_CLASS_AT(p,x,base)	assert((p) < numparam); assert(param[p].Type == REGT_POINTER && (param[p].atag == ATAG_OBJECT || param[p].a == NULL)); base::MetaClass *x = (base::MetaClass *)param[p].a; assert(x == NULL || x->IsDescendantOf(RUNTIME_CLASS(base)));
 
 // For optional paramaters. These have dangling elses for you to fill in the default assignment. e.g.:
 //		PARAM_INT_OPT(0,myint) { myint = 55; }
@@ -918,7 +918,7 @@ void VMDisasm(FILE *out, const VMOP *code, int codesize, const VMScriptFunction
 #define PARAM_STATE_OPT_AT(p,x)			FState *x; if ((p) < numparam && param[p].Type != REGT_NIL) { assert(param[p].Type == REGT_POINTER && (param[p].atag == ATAG_STATE || param[p].a == NULL)); x = (FState *)param[p].a; } else
 #define PARAM_POINTER_OPT_AT(p,x,type)	type *x; if ((p) < numparam && param[p].Type != REGT_NIL) { assert(param[p].Type == REGT_POINTER); x = (type *)param[p].a; } else
 #define PARAM_OBJECT_OPT_AT(p,x,type)	type *x; if ((p) < numparam && param[p].Type != REGT_NIL) { assert(param[p].Type == REGT_POINTER && (param[p].atag == ATAG_OBJECT || param[p].a == NULL)); x = (type *)param[p].a; assert(x == NULL || x->IsKindOf(RUNTIME_CLASS(type))); } else
-#define PARAM_CLASS_OPT_AT(p,x,base)	base::MetaClass *x; if ((p) < numparam && param[p].Type != REGT_NIL) { assert(param[p].Type == REGT_POINTER && (param[p].atag == ATAG_OBJECT || param[p].a == NULL)); x = (base::MetaClass *)param[p].a; assert(x != NULL && x->IsDescendantOf(RUNTIME_CLASS(base))); } else
+#define PARAM_CLASS_OPT_AT(p,x,base)	base::MetaClass *x; if ((p) < numparam && param[p].Type != REGT_NIL) { assert(param[p].Type == REGT_POINTER && (param[p].atag == ATAG_OBJECT || param[p].a == NULL)); x = (base::MetaClass *)param[p].a; assert(x == NULL || x->IsDescendantOf(RUNTIME_CLASS(base))); } else
 
 // The above, but with an automatically increasing position index.
 #define PARAM_PROLOGUE				int paramnum = -1;