diff --git a/src/buffer.c b/src/buffer.c
index 36396e8..243593a 100644
--- a/src/buffer.c
+++ b/src/buffer.c
@@ -4221,7 +4221,7 @@
     stl_hlrec_T **tabtab)	// return: tab page nrs (can be NULL)
 {
     linenr_T	lnum;
-    size_t	len;
+    colnr_T	len;
     char_u	*p;
     char_u	*s;
     char_u	*t;
@@ -4328,12 +4328,12 @@
 
     // Get the byte value now, in case we need it below. This is more efficient
     // than making a copy of the line.
-    len = STRLEN(p);
-    if (wp->w_cursor.col > (colnr_T)len)
+    len = ml_get_buf_len(wp->w_buffer, lnum);
+    if (wp->w_cursor.col > len)
     {
 	// Line may have changed since checking the cursor column, or the lnum
 	// was adjusted above.
-	wp->w_cursor.col = (colnr_T)len;
+	wp->w_cursor.col = len;
 	wp->w_cursor.coladd = 0;
 	byteval = 0;
     }