diff --git a/src/if_ruby.c b/src/if_ruby.c
index 29c62b8..3685db0 100644
--- a/src/if_ruby.c
+++ b/src/if_ruby.c
@@ -643,11 +643,23 @@
 
 static VALUE set_buffer_line(buf_T *buf, linenr_T n, VALUE str)
 {
-    buf_T *savebuf = curbuf;
-    char *line = STR2CSTR(str);
+    char	*line = STR2CSTR(str);
+#ifdef FEAT_AUTOCMD
+    aco_save_T	aco;
+#else
+    buf_T	*save_curbuf = curbuf;
+#endif
 
-    if (n > 0 && n <= buf->b_ml.ml_line_count && line != NULL) {
+    if (n > 0 && n <= buf->b_ml.ml_line_count && line != NULL)
+    {
+#ifdef FEAT_AUTOCMD
+	/* set curwin/curbuf for "buf" and save some things */
+	aucmd_prepbuf(&aco, buf);
+#else
 	curbuf = buf;
+	curwin->w_buffer = buf;
+#endif
+
 	if (u_savesub(n) == OK) {
 	    ml_replace(n, (char_u *)line, TRUE);
 	    changed();
@@ -655,10 +667,19 @@
 	    syn_changed(n); /* recompute syntax hl. for this line */
 #endif
 	}
-	curbuf = savebuf;
+
+#ifdef FEAT_AUTOCMD
+	/* restore curwin/curbuf and a few other things */
+	aucmd_restbuf(&aco);
+	/* Careful: autocommands may have made "buf" invalid! */
+#else
+	curwin->w_buffer = save_curbuf;
+	curbuf = save_curbuf;
+#endif
 	update_curbuf(NOT_VALID);
     }
-    else {
+    else
+    {
 	rb_raise(rb_eIndexError, "index %d out of buffer", n);
 	return Qnil; /* For stop warning */
     }
@@ -676,12 +697,24 @@
 
 static VALUE buffer_delete(VALUE self, VALUE num)
 {
-    buf_T *buf = get_buf(self);
-    buf_T *savebuf = curbuf;
-    long n = NUM2LONG(num);
+    buf_T	*buf = get_buf(self);
+    long	n = NUM2LONG(num);
+#ifdef FEAT_AUTOCMD
+    aco_save_T	aco;
+#else
+    buf_T	*save_curbuf = curbuf;
+#endif
 
-    if (n > 0 && n <= buf->b_ml.ml_line_count) {
+    if (n > 0 && n <= buf->b_ml.ml_line_count)
+    {
+#ifdef FEAT_AUTOCMD
+	/* set curwin/curbuf for "buf" and save some things */
+	aucmd_prepbuf(&aco, buf);
+#else
 	curbuf = buf;
+	curwin->w_buffer = buf;
+#endif
+
 	if (u_savedel(n, 1) == OK) {
 	    ml_delete(n, 0);
 
@@ -691,10 +724,19 @@
 
 	    changed();
 	}
-	curbuf = savebuf;
+
+#ifdef FEAT_AUTOCMD
+	/* restore curwin/curbuf and a few other things */
+	aucmd_restbuf(&aco);
+	/* Careful: autocommands may have made "buf" invalid! */
+#else
+	curwin->w_buffer = save_curbuf;
+	curbuf = save_curbuf;
+#endif
 	update_curbuf(NOT_VALID);
     }
-    else {
+    else
+    {
 	rb_raise(rb_eIndexError, "index %d out of buffer", n);
     }
     return Qnil;
@@ -702,13 +744,25 @@
 
 static VALUE buffer_append(VALUE self, VALUE num, VALUE str)
 {
-    buf_T *buf = get_buf(self);
-    buf_T *savebuf = curbuf;
-    char *line = STR2CSTR(str);
-    long n = NUM2LONG(num);
+    buf_T	*buf = get_buf(self);
+    char	*line = STR2CSTR(str);
+    long	n = NUM2LONG(num);
+#ifdef FEAT_AUTOCMD
+    aco_save_T	aco;
+#else
+    buf_T	*save_curbuf = curbuf;
+#endif
 
-    if (n >= 0 && n <= buf->b_ml.ml_line_count && line != NULL) {
+    if (n >= 0 && n <= buf->b_ml.ml_line_count && line != NULL)
+    {
+#ifdef FEAT_AUTOCMD
+	/* set curwin/curbuf for "buf" and save some things */
+	aucmd_prepbuf(&aco, buf);
+#else
 	curbuf = buf;
+	curwin->w_buffer = buf;
+#endif
+
 	if (u_inssub(n + 1) == OK) {
 	    ml_append(n, (char_u *) line, (colnr_T) 0, FALSE);
 
@@ -718,7 +772,15 @@
 
 	    changed();
 	}
-	curbuf = savebuf;
+
+#ifdef FEAT_AUTOCMD
+	/* restore curwin/curbuf and a few other things */
+	aucmd_restbuf(&aco);
+	/* Careful: autocommands may have made "buf" invalid! */
+#else
+	curwin->w_buffer = save_curbuf;
+	curbuf = save_curbuf;
+#endif
 	update_curbuf(NOT_VALID);
     }
     else {