diff --git a/src/mbyte.c b/src/mbyte.c
index b896477..80f6691 100644
--- a/src/mbyte.c
+++ b/src/mbyte.c
@@ -869,11 +869,19 @@
 mb_get_class(p)
     char_u	*p;
 {
+    return mb_get_class_buf(p, curbuf);
+}
+
+    int
+mb_get_class_buf(p, buf)
+    char_u	*p;
+    buf_T	*buf;
+{
     if (MB_BYTE2LEN(p[0]) == 1)
     {
 	if (p[0] == NUL || vim_iswhite(p[0]))
 	    return 0;
-	if (vim_iswordc(p[0]))
+	if (vim_iswordc_buf(p[0], buf))
 	    return 2;
 	return 1;
     }
diff --git a/src/proto/mbyte.pro b/src/proto/mbyte.pro
index 8c0788c..c599dac 100644
--- a/src/proto/mbyte.pro
+++ b/src/proto/mbyte.pro
@@ -4,6 +4,7 @@
 int bomb_size __ARGS((void));
 void remove_bom __ARGS((char_u *s));
 int mb_get_class __ARGS((char_u *p));
+int mb_get_class_buf __ARGS((char_u *p, buf_T *buf));
 int dbcs_class __ARGS((unsigned lead, unsigned trail));
 int latin_char2len __ARGS((int c));
 int latin_char2bytes __ARGS((int c, char_u *buf));
diff --git a/src/regexp.c b/src/regexp.c
index e62aae5..b6506a0 100644
--- a/src/regexp.c
+++ b/src/regexp.c
@@ -4013,8 +4013,8 @@
 reg_prev_class()
 {
     if (reginput > regline)
-	return mb_get_class(reginput - 1
-				     - (*mb_head_off)(regline, reginput - 1));
+	return mb_get_class_buf(reginput - 1
+			    - (*mb_head_off)(regline, reginput - 1), reg_buf);
     return -1;
 }
 
@@ -4304,7 +4304,7 @@
 		int this_class;
 
 		/* Get class of current and previous char (if it exists). */
-		this_class = mb_get_class(reginput);
+		this_class = mb_get_class_buf(reginput, reg_buf);
 		if (this_class <= 1)
 		    status = RA_NOMATCH;  /* not on a word at all */
 		else if (reg_prev_class() == this_class)
@@ -4328,7 +4328,7 @@
 		int this_class, prev_class;
 
 		/* Get class of current and previous char (if it exists). */
-		this_class = mb_get_class(reginput);
+		this_class = mb_get_class_buf(reginput, reg_buf);
 		prev_class = reg_prev_class();
 		if (this_class == prev_class
 			|| prev_class == 0 || prev_class == 1)
@@ -4365,14 +4365,14 @@
 	    break;
 
 	  case KWORD:
-	    if (!vim_iswordp(reginput))
+	    if (!vim_iswordp_buf(reginput, reg_buf))
 		status = RA_NOMATCH;
 	    else
 		ADVANCE_REGINPUT();
 	    break;
 
 	  case SKWORD:
-	    if (VIM_ISDIGIT(*reginput) || !vim_iswordp(reginput))
+	    if (VIM_ISDIGIT(*reginput) || !vim_iswordp_buf(reginput, reg_buf))
 		status = RA_NOMATCH;
 	    else
 		ADVANCE_REGINPUT();
@@ -5734,7 +5734,8 @@
       case SKWORD + ADD_NL:
 	while (count < maxcount)
 	{
-	    if (vim_iswordp(scan) && (testval || !VIM_ISDIGIT(*scan)))
+	    if (vim_iswordp_buf(scan, reg_buf)
+					  && (testval || !VIM_ISDIGIT(*scan)))
 	    {
 		mb_ptr_adv(scan);
 	    }
diff --git a/src/version.c b/src/version.c
index 8c19a15..ecf21ac 100644
--- a/src/version.c
+++ b/src/version.c
@@ -726,6 +726,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    789,
+/**/
     788,
 /**/
     787,