diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c
index f7f9fed737..88660e85b7 100644
--- a/hw/usb/hcd-xhci.c
+++ b/hw/usb/hcd-xhci.c
@@ -1151,7 +1151,7 @@ static void xhci_reset_streams(XHCIEPContext *epctx)
 static void xhci_alloc_streams(XHCIEPContext *epctx, dma_addr_t base)
 {
     assert(epctx->pstreams == NULL);
-    epctx->nr_pstreams = 2 << (epctx->max_pstreams + 1);
+    epctx->nr_pstreams = 2 << epctx->max_pstreams;
     epctx->pstreams = xhci_alloc_stream_contexts(epctx->nr_pstreams, base);
 }