diff --git a/artiq/firmware/libboard_artiq/hmc830_7043.rs b/artiq/firmware/libboard_artiq/hmc830_7043.rs
index 194211612..880a1d085 100644
--- a/artiq/firmware/libboard_artiq/hmc830_7043.rs
+++ b/artiq/firmware/libboard_artiq/hmc830_7043.rs
@@ -156,7 +156,7 @@ pub mod hmc7043 {
         (true,  DAC_CLK_DIV,  0x08, false),  //  2: DAC0_CLK
         (true,  SYSREF_DIV,   0x08, true),   //  3: DAC0_SYSREF
         (false, 0,            0x10, true),   //  4: AMC_FPGA_SYSREF0
-        (false, 0,            0x10, true),   //  5: AMC_FPGA_SYSREF1
+        (true,  SYSREF_DIV,   0x10, true),   //  5: AMC_FPGA_SYSREF1
         (false, 0,            0x10, false),  //  6: unused
         (true,  SYSREF_DIV,   0x10, true),   //  7: RTM_FPGA_SYSREF0
         (true,  FPGA_CLK_DIV, 0x08, false),  //  8: GTP_CLK0_IN