diff --git a/src/main/scala/devices/spi/SPIArbiter.scala b/src/main/scala/devices/spi/SPIArbiter.scala
index df87d95..3c0c74a 100644
--- a/src/main/scala/devices/spi/SPIArbiter.scala
+++ b/src/main/scala/devices/spi/SPIArbiter.scala
@@ -21,7 +21,7 @@ class SPIArbiter(c: SPIParamsBase, n: Int) extends Module {
   io.outer.cnt := Mux1H(sel, io.inner.map(_.cnt))
   io.outer.fmt := Mux1H(sel, io.inner.map(_.fmt))
   // Workaround for overzealous combinational loop detection
-  io.outer.cs := Mux(sel(1), io.inner(0).cs, io.inner(1).cs)
+  io.outer.cs := Mux(sel(0), io.inner(0).cs, io.inner(1).cs)
   require(n == 2, "SPIArbiter currently only supports 2 clients")
 
   (io.inner zip sel).foreach { case (inner, s) =>