diff --git a/t/t4051-diff-function-context.sh b/t/t4051-diff-function-context.sh
index b6bb04ab82..b79b87790b 100755
--- a/t/t4051-diff-function-context.sh
+++ b/t/t4051-diff-function-context.sh
@@ -64,7 +64,13 @@ test_expect_success 'setup' '
 
 	grep -v "Begin of second part" <file.c >file.c.new &&
 	mv file.c.new file.c &&
-	commit_and_tag long_common_tail file.c
+	commit_and_tag long_common_tail file.c &&
+
+	git checkout initial &&
+	grep -v "delete me from hello" <file.c >file.c.new &&
+	mv file.c.new file.c &&
+	cat "$dir/appended1.c" >>file.c &&
+	commit_and_tag changed_hello_appended file.c
 '
 
 check_diff changed_hello 'changed function'
@@ -157,4 +163,20 @@ test_expect_success ' context does not include preceding empty lines' '
 	test "$(first_context_line <long_common_tail.diff.diff)" != " "
 '
 
+check_diff changed_hello_appended 'changed function plus appended function'
+
+test_expect_success ' context includes begin' '
+	grep "^ .*Begin of hello" changed_hello_appended.diff &&
+	grep "^[+].*Begin of first part" changed_hello_appended.diff
+'
+
+test_expect_success ' context includes end' '
+	grep "^ .*End of hello" changed_hello_appended.diff &&
+	grep "^[+].*End of first part" changed_hello_appended.diff
+'
+
+test_expect_success ' context does not include other functions' '
+	test $(grep -c "^[ +-].*Begin" changed_hello_appended.diff) -le 2
+'
+
 test_done
diff --git a/xdiff/xemit.c b/xdiff/xemit.c
index bfa53d3dcd..49aa16ff78 100644
--- a/xdiff/xemit.c
+++ b/xdiff/xemit.c
@@ -246,7 +246,8 @@ int xdl_emit_diff(xdfenv_t *xe, xdchange_t *xscr, xdemitcb_t *ecb,
 			 * its new end.
 			 */
 			if (xche->next) {
-				long l = xche->next->i1;
+				long l = XDL_MIN(xche->next->i1,
+						 xe->xdf1.nrec - 1);
 				if (l <= e1 ||
 				    get_func_line(xe, xecfg, NULL, l, e1) < 0) {
 					xche = xche->next;