diff --git a/src/option.c b/src/option.c
index 3753c4a..60e1cf0 100644
--- a/src/option.c
+++ b/src/option.c
@@ -6628,6 +6628,7 @@
 #ifdef FEAT_DIFF
 	case PV_DIFF:	return (char_u *)&(curwin->w_p_diff);
 #endif
+	case PV_EIW:	return (char_u *)&(curwin->w_p_eiw);
 #ifdef FEAT_FOLDING
 	case PV_FDC:	return (char_u *)&(curwin->w_p_fdc);
 	case PV_FEN:	return (char_u *)&(curwin->w_p_fen);
@@ -6941,6 +6942,7 @@
     to->wo_diff = from->wo_diff;
     to->wo_diff_saved = from->wo_diff_saved;
 #endif
+    to->wo_eiw = copy_option_val(from->wo_eiw);
 #ifdef FEAT_CONCEAL
     to->wo_cocu = copy_option_val(from->wo_cocu);
     to->wo_cole = from->wo_cole;
@@ -7006,6 +7008,7 @@
 # endif
     check_string_option(&wop->wo_fmr);
 #endif
+    check_string_option(&wop->wo_eiw);
 #ifdef FEAT_SIGNS
     check_string_option(&wop->wo_scl);
 #endif
@@ -7054,6 +7057,7 @@
 # endif
     clear_string_option(&wop->wo_fmr);
 #endif
+    clear_string_option(&wop->wo_eiw);
 #ifdef FEAT_SIGNS
     clear_string_option(&wop->wo_scl);
 #endif