diff --git a/sys/src/9/pc/devarch.c b/sys/src/9/pc/devarch.c
index 523f2262a..7870ad6d4 100644
--- a/sys/src/9/pc/devarch.c
+++ b/sys/src/9/pc/devarch.c
@@ -36,7 +36,7 @@ enum {
 	Qmsr,
 	Qbase,
 
-	Qmax = 16,
+	Qmax = 32,
 };
 
 enum {