diff --git a/src/option.h b/src/option.h
index db1030d..bb1226e 100644
--- a/src/option.h
+++ b/src/option.h
@@ -731,6 +731,7 @@
 EXTERN char_u	*p_indk;	// 'indentkeys'
 #endif
 EXTERN int	p_im;		// 'insertmode'
+EXTERN char_u	*p_ise;		// 'isexpand'
 EXTERN char_u	*p_isf;		// 'isfname'
 EXTERN char_u	*p_isi;		// 'isident'
 EXTERN char_u	*p_isk;		// 'iskeyword'
@@ -1205,6 +1206,7 @@
     , BV_INEX
 #endif
     , BV_INF
+    , BV_ISE
     , BV_ISK
 #ifdef FEAT_CRYPT
     , BV_KEY