diff --git a/tcc-doc.texi b/tcc-doc.texi
index 9b61795..ff18c3e 100644
--- a/tcc-doc.texi
+++ b/tcc-doc.texi
@@ -935,7 +935,7 @@ be the best solution.
 #define VT_VOLATILE   0x0200  /* volatile modifier */
 #define VT_SIGNED     0x0400  /* signed type */
 
-#define VT_STRUCT_SHIFT 16   /* structure/enum name shift (16 bits left) */
+#define VT_STRUCT_SHIFT 18   /* structure/enum name shift (14 bits left) */
 @end example
 
 When a reference to another type is needed (for pointers, functions and
diff --git a/tcc.h b/tcc.h
index 2b5aa2b..e1b548b 100644
--- a/tcc.h
+++ b/tcc.h
@@ -632,7 +632,7 @@ struct TCCState {
 #define VT_EXPORT  0x00010000  /* win32: data exported from dll */
 #define VT_WEAK    0x00020000  /* win32: data exported from dll */
 
-#define VT_STRUCT_SHIFT 17   /* shift for bitfield shift values */
+#define VT_STRUCT_SHIFT 18   /* shift for bitfield shift values */
 
 /* type mask (except storage) */
 #define VT_STORAGE (VT_EXTERN | VT_STATIC | VT_TYPEDEF | VT_INLINE | VT_IMPORT | VT_EXPORT | VT_WEAK)