diff --git a/src/option.c b/src/option.c
index 5b50913..5f8489f 100644
--- a/src/option.c
+++ b/src/option.c
@@ -1606,13 +1606,22 @@
 #endif
 			    SCRIPTID_INIT},
     {"imstatusfunc","imsf",P_STRING|P_VI_DEF|P_SECURE,
-# if defined(FEAT_EVAL) && defined(FEAT_XIM) && defined(FEAT_GUI_GTK)
+#if defined(FEAT_EVAL) && defined(FEAT_XIM) && defined(FEAT_GUI_GTK)
 			    (char_u *)&p_imsf, PV_NONE,
 			    {(char_u *)"", (char_u *)NULL}
-# else
+#else
 			    (char_u *)NULL, PV_NONE,
 			    {(char_u *)NULL, (char_u *)0L}
-# endif
+#endif
+			    SCRIPTID_INIT},
+    {"imstyle",	    "imst", P_NUM|P_VI_DEF|P_SECURE,
+#if defined(FEAT_XIM) && defined(FEAT_GUI_GTK)
+			    (char_u *)&p_imst, PV_NONE,
+			    {(char_u *)IM_OVER_THE_SPOT, (char_u *)0L}
+#else
+			    (char_u *)NULL, PV_NONE,
+			    {(char_u *)0L, (char_u *)0L}
+#endif
 			    SCRIPTID_INIT},
     {"include",	    "inc",  P_STRING|P_ALLOCED|P_VI_DEF,
 #ifdef FEAT_FIND_ID
@@ -8990,6 +8999,15 @@
 #endif
     }
 
+#if defined(FEAT_XIM) && defined(FEAT_GUI_GTK)
+    /* 'imstyle' */
+    else if (pp == &p_imst)
+    {
+	if (p_imst != IM_ON_THE_SPOT && p_imst != IM_OVER_THE_SPOT)
+	    errmsg = e_invarg;
+    }
+#endif
+
     else if (pp == &p_window)
     {
 	if (p_window < 1)