diff --git a/src/regexp.c b/src/regexp.c
index b078de3..bb63c94 100644
--- a/src/regexp.c
+++ b/src/regexp.c
@@ -3623,7 +3623,6 @@
     proftime_T	*tm;		/* timeout limit or NULL */
 {
     long	r;
-    buf_T	*save_curbuf = curbuf;
 
     reg_match = NULL;
     reg_mmatch = rmp;
@@ -3638,10 +3637,7 @@
 #endif
     ireg_maxcol = rmp->rmm_maxcol;
 
-    /* Need to switch to buffer "buf" to make vim_iswordc() work. */
-    curbuf = buf;
     r = vim_regexec_both(NULL, col, tm);
-    curbuf = save_curbuf;
 
     return r;
 }
@@ -4185,7 +4181,7 @@
 		int	cmp = OPERAND(scan)[1];
 		pos_T	*pos;
 
-		pos = getmark(mark, FALSE);
+		pos = getmark_buf(reg_buf, mark, FALSE);
 		if (pos == NULL		     /* mark doesn't exist */
 			|| pos->lnum <= 0    /* mark isn't set (in curbuf) */
 			|| (pos->lnum == reglnum + reg_firstlnum
@@ -4315,8 +4311,8 @@
 #endif
 	    else
 	    {
-		if (!vim_iswordc(c)
-			|| (reginput > regline && vim_iswordc(reginput[-1])))
+		if (!vim_iswordc_buf(c, reg_buf)
+			|| (reginput > regline && vim_iswordc_buf(reginput[-1], reg_buf)))
 		    status = RA_NOMATCH;
 	    }
 	    break;
@@ -4339,8 +4335,8 @@
 #endif
 	    else
 	    {
-		if (!vim_iswordc(reginput[-1])
-			|| (reginput[0] != NUL && vim_iswordc(c)))
+		if (!vim_iswordc_buf(reginput[-1], reg_buf)
+			|| (reginput[0] != NUL && vim_iswordc_buf(c, reg_buf)))
 		    status = RA_NOMATCH;
 	    }
 	    break; /* Matched with EOW */