diff --git a/runtime.c b/runtime.c
index 978ab1ff..34aa422d 100644
--- a/runtime.c
+++ b/runtime.c
@@ -1102,7 +1102,7 @@ void _string_91_125list(object cont, object args) {
     return_funcall1(cont, &lst);}
 void _make_91vector(object cont, object args) {
     make_vector(v, car(args), cadr(args));
-    return_funcall1(cont, &v);}
+    return_funcall1(cont, v);}
 void _list_91_125string(object cont, object args) {  
     string_type s = Cyc_list2string(car(args));
     return_funcall1(cont, &s);}
diff --git a/runtime.h b/runtime.h
index e2d99bf1..0319fcec 100644
--- a/runtime.h
+++ b/runtime.h
@@ -150,6 +150,7 @@ void dispatch(int argc, function_type func, object clo, object cont, object args
 void dispatch_va(int argc, function_type_va func, object clo, object cont, object args);
 void do_dispatch(int argc, function_type func, object clo, object *buffer);
 
+// Note: below is OK since alloca memory is not freed until function exits
 #define string2list(c,s) object c = nil; { \
   char *str = ((string_type *)s)->str; \
   int len = strlen(str); \
@@ -161,14 +162,14 @@ void do_dispatch(int argc, function_type func, object clo, object *buffer);
   } \
 }
 
-// v = (object)alloca(sizeof(vector_type));
-#define make_vector(v, len, fill) vector_type v; { \
+#define make_vector(v, len, fill) object v = nil; { \
+ v = alloca(sizeof(vector_type)); \
+ ((vector)v)->tag = vector_tag; \
+ ((vector)v)->num_elt = ((integer_type *)len)->value; \
+ ((vector)v)->elts = (((vector)v)->num_elt > 0) ? (object *)alloca(sizeof(object) * ((vector)v)->num_elt): NULL; \
  int i; \
- v.tag = vector_tag; \
- v.num_elt = ((integer_type *)len)->value; \
- v.elts = (v.num_elt > 0) ? (object *)alloca(sizeof(object) * v.num_elt): NULL; \
- for (i = 0; i < v.num_elt; i++) { \
-   v.elts[i] = fill; \
+ for (i = 0; i < ((vector)v)->num_elt; i++) { \
+   ((vector)v)->elts[i] = fill; \
  } \
 }
 
diff --git a/test.scm b/test.scm
index 68c89e55..3c31df68 100644
--- a/test.scm
+++ b/test.scm
@@ -5,3 +5,4 @@
 (write `(read ,(list 1 2 3)))
 (write `(read ,@(list 1 2 3)))
 ;`(read ,
+(write (make-vector 4 #t))
diff --git a/trans.scm b/trans.scm
index 0230dbfc..cd3e26e4 100644
--- a/trans.scm
+++ b/trans.scm
@@ -536,6 +536,7 @@
      write
      display))
 
+;; Constant Folding
 ;; Is a primitive being applied in such a way that it can be
 ;; evaluated at compile time?
 (define (precompute-prim-app? ast)
@@ -562,6 +563,7 @@
                   set-cdr!
                   string->symbol ;; Could be mistaken for an identifier
                   string->list ;; Mistaken for function call (maybe OK if it was quoted, though). same for above?
+                  make-vector
                   ;; I/O must be done at runtime for side effects:
                   current-input-port
                   open-input-file