diff --git a/stratosphere/boot/source/boot_clock_initial_configuration.cpp b/stratosphere/boot/source/boot_clock_initial_configuration.cpp
index f70ffaa21..20ce31ded 100644
--- a/stratosphere/boot/source/boot_clock_initial_configuration.cpp
+++ b/stratosphere/boot/source/boot_clock_initial_configuration.cpp
@@ -18,9 +18,11 @@
 #include "boot_registers_pmc.hpp"
 
 static constexpr u32 PmcClkOutCntrl = PmcBase + APBDEV_PMC_CLK_OUT_CNTRL;
-static constexpr u32 InitialClockOutMask = 0xC4C4;
+static constexpr u32 InitialClockOutMask1x = 0x00C4;
+static constexpr u32 InitialClockOutMask6x = 0xC4C4;
 
 void Boot::SetInitialClockConfiguration() {
     /* Write mask to APBDEV_PMC_PWR_DET, then clear APBDEV_PMC_PWR_DET_VAL. */
-    WritePmcRegister(PmcClkOutCntrl, InitialClockOutMask, InitialClockOutMask);
+    const u32 mask = GetRuntimeFirmwareVersion() >= FirmwareVersion_600 ? InitialClockOutMask6x : InitialClockOutMask1x;
+    WritePmcRegister(PmcClkOutCntrl, mask, mask);
 }