diff --git a/tests/regression/pipe/alter-1.cir b/tests/regression/pipe/alter-1.cir
new file mode 100644
index 000000000..d0fcacbb1
--- /dev/null
+++ b/tests/regression/pipe/alter-1.cir
@@ -0,0 +1,2 @@
+*
+v1  1 0  dc=0 sin(0v, 0.1v, 100Meg)