diff --git a/bochs/iodev/sound/es1370.cc b/bochs/iodev/sound/es1370.cc
index f05c25339..8752e4117 100644
--- a/bochs/iodev/sound/es1370.cc
+++ b/bochs/iodev/sound/es1370.cc
@@ -45,7 +45,7 @@
 
 bx_es1370_c* theES1370Device = NULL;
 
-const Bit8u es1370_iomask[64] = {7, 1, 3, 1, 4, 0, 0, 0, 7, 1, 1, 0, 7, 0, 0, 0,
+const Bit8u es1370_iomask[64] = {7, 1, 3, 1, 4, 1, 0, 0, 7, 1, 1, 0, 7, 0, 0, 0,
                                  6, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0,
                                  7, 1, 3, 1, 6, 0, 2, 0, 6, 0, 2, 0, 6, 0, 2, 0,
                                  4, 0, 0, 0, 6, 0, 2, 0, 4, 0, 0, 0, 6, 0, 2, 0};