diff --git a/artiq/coredevice/dac34h84.py b/artiq/coredevice/dac34h84.py
index 51b93e6a0..4063551aa 100644
--- a/artiq/coredevice/dac34h84.py
+++ b/artiq/coredevice/dac34h84.py
@@ -201,7 +201,7 @@ class DAC34H84:
         mmap.append(
             (0x0d << 16) |
             (self.cmix_fs8 << 15) | (self.cmix_fs4 << 14) |
-            (self.cmix_fs2 << 12) | (self.cmix_nfs4 << 11) |
+            (self.cmix_fs2 << 13) | (self.cmix_nfs4 << 12) |
             (self.qmc_gainb << 0))
         mmap.append((0x0e << 16) | (self.qmc_gainc << 0))
         mmap.append(