diff --git a/tcc.h b/tcc.h
index 9e7c574..859c85f 100644
--- a/tcc.h
+++ b/tcc.h
@@ -1135,7 +1135,8 @@ ST_DATA Sym *local_label_stack;
 ST_DATA Sym *global_label_stack;
 ST_DATA Sym *define_stack;
 ST_DATA CType char_pointer_type, func_old_type, int_type, size_type;
-ST_DATA SValue vstack[VSTACK_SIZE], *vtop;
+ST_DATA SValue __vstack[1+/*to make bcheck happy*/ VSTACK_SIZE], *vtop;
+#define vstack  (__vstack + 1)
 ST_DATA int rsym, anon_sym, ind, loc;
 
 ST_DATA int const_wanted; /* true if constant wanted */
diff --git a/tccgen.c b/tccgen.c
index f79da36..b9142d2 100644
--- a/tccgen.c
+++ b/tccgen.c
@@ -55,7 +55,7 @@ ST_DATA Sym *define_stack;
 ST_DATA Sym *global_label_stack;
 ST_DATA Sym *local_label_stack;
 
-ST_DATA SValue vstack[VSTACK_SIZE], *vtop;
+ST_DATA SValue __vstack[1+VSTACK_SIZE], *vtop;
 
 ST_DATA int const_wanted; /* true if constant wanted */
 ST_DATA int nocode_wanted; /* true if no code generation wanted for an expression */
diff --git a/tccpp.c b/tccpp.c
index aff5a53..b80c986 100644
--- a/tccpp.c
+++ b/tccpp.c
@@ -3041,7 +3041,6 @@ ST_FUNC void preprocess_init(TCCState *s1)
     s1->ifdef_stack_ptr = s1->ifdef_stack;
     file->ifdef_stack_ptr = s1->ifdef_stack_ptr;
 
-    /* XXX: not ANSI compliant: bound checking says error */
     vtop = vstack - 1;
     s1->pack_stack[0] = 0;
     s1->pack_stack_ptr = s1->pack_stack;