diff --git a/include/kernel/config_mem.hpp b/include/kernel/config_mem.hpp
index 81f0fef1..0e7e06b2 100644
--- a/include/kernel/config_mem.hpp
+++ b/include/kernel/config_mem.hpp
@@ -8,6 +8,7 @@ namespace ConfigMem {
 		KernelVersionMajor = 0x1FF80003,
 		SyscoreVer = 0x1FF80010,
 		EnvInfo = 0x1FF80014,
+		PrevFirm = 0x1FF80016,
 		AppMemAlloc = 0x1FF80040,
 		FirmUnknown = 0x1FF80060,
 		FirmRevision = 0x1FF80061,
diff --git a/src/core/memory.cpp b/src/core/memory.cpp
index f03e80f7..d551028c 100644
--- a/src/core/memory.cpp
+++ b/src/core/memory.cpp
@@ -108,6 +108,7 @@ u8 Memory::read8(u32 vaddr) {
 				return getBatteryState(chargerPlugged, charging, batteryLevel);
 			}
 			case ConfigMem::EnvInfo: return envInfo;
+			case ConfigMem::PrevFirm: return 0;
 			case ConfigMem::HardwareType: return ConfigMem::HardwareCodes::Product;
 			case ConfigMem::KernelVersionMinor: return u8(kernelVersion & 0xff);
 			case ConfigMem::KernelVersionMajor: return u8(kernelVersion >> 8);