diff --git a/src/optiondefs.h b/src/optiondefs.h
index 8ec012f..de04abe 100644
--- a/src/optiondefs.h
+++ b/src/optiondefs.h
@@ -194,6 +194,7 @@
 #endif
 #define PV_SCBIND	OPT_WIN(WV_SCBIND)
 #define PV_SCROLL	OPT_WIN(WV_SCROLL)
+#define PV_SMS		OPT_WIN(WV_SMS)
 #define PV_SISO		OPT_BOTH(OPT_WIN(WV_SISO))
 #define PV_SO		OPT_BOTH(OPT_WIN(WV_SO))
 #ifdef FEAT_SPELL
@@ -2282,6 +2283,9 @@
     {"smarttab",    "sta",  P_BOOL|P_VI_DEF|P_VIM,
 			    (char_u *)&p_sta, PV_NONE,
 			    {(char_u *)FALSE, (char_u *)0L} SCTX_INIT},
+    {"smoothscroll", "sms", P_BOOL|P_VI_DEF|P_RWIN,
+			    (char_u *)VAR_WIN, PV_SMS,
+			    {(char_u *)FALSE, (char_u *)0L} SCTX_INIT},
     {"softtabstop", "sts",  P_NUM|P_VI_DEF|P_VIM,
 			    (char_u *)&p_sts, PV_STS,
 			    {(char_u *)0L, (char_u *)0L} SCTX_INIT},