diff --git a/src/vim.h b/src/vim.h
index 05efc9a..bfbfde0 100644
--- a/src/vim.h
+++ b/src/vim.h
@@ -1688,7 +1688,8 @@
 #define VV_MOUSE_WIN	49
 #define VV_MOUSE_LNUM   50
 #define VV_MOUSE_COL	51
-#define VV_LEN		52	/* number of v: vars */
+#define VV_OP		52
+#define VV_LEN		53	/* number of v: vars */
 
 #ifdef FEAT_CLIPBOARD