diff --git a/src/option.h b/src/option.h
index df5bf4d..70206f3 100644
--- a/src/option.h
+++ b/src/option.h
@@ -1288,6 +1288,7 @@
 #ifdef FEAT_DIFF
     , WV_DIFF
 #endif
+    , WV_EIW
 #ifdef FEAT_FOLDING
     , WV_FDC
     , WV_FEN