diff --git a/src/ops.c b/src/ops.c
index 66b9b59..8505f64 100644
--- a/src/ops.c
+++ b/src/ops.c
@@ -4452,6 +4452,12 @@
     for (t = 0; t < count; ++t)
     {
 	curr = curr_start = ml_get((linenr_T)(curwin->w_cursor.lnum + t));
+	if (t == 0)
+	{
+	    /* Set the '[ mark. */
+	    curwin->w_buffer->b_op_start.lnum = curwin->w_cursor.lnum;
+	    curwin->w_buffer->b_op_start.col  = (colnr_T)STRLEN(curr);
+	}
 #if defined(FEAT_COMMENTS) || defined(PROTO)
 	if (remove_comments)
 	{
@@ -4568,6 +4574,10 @@
     }
     ml_replace(curwin->w_cursor.lnum, newp, FALSE);
 
+    /* Set the '] mark. */
+    curwin->w_buffer->b_op_end.lnum = curwin->w_cursor.lnum;
+    curwin->w_buffer->b_op_end.col  = (colnr_T)STRLEN(newp);
+
     /* Only report the change in the first line here, del_lines() will report
      * the deleted line. */
     changed_lines(curwin->w_cursor.lnum, currsize,