diff --git a/External/FEXCore/Source/Interface/Context/Context.h b/External/FEXCore/Source/Interface/Context/Context.h
index f8f228bb3..33a822f07 100644
--- a/External/FEXCore/Source/Interface/Context/Context.h
+++ b/External/FEXCore/Source/Interface/Context/Context.h
@@ -49,7 +49,7 @@ namespace FEXCore::Context {
       uint64_t VirtualMemSize {1ULL << 36};
       FEXCore::Config::ConfigCore Core {FEXCore::Config::CONFIG_INTERPRETER};
       bool GdbServer {false};
-      bool UnifiedMemory {false};
+      bool UnifiedMemory {true};
       std::string RootFSPath;
 
       // LLVM JIT options
diff --git a/Source/Tests/TestHarnessRunner.cpp b/Source/Tests/TestHarnessRunner.cpp
index 914bfc31a..7fdd882ec 100644
--- a/Source/Tests/TestHarnessRunner.cpp
+++ b/Source/Tests/TestHarnessRunner.cpp
@@ -70,6 +70,7 @@ int main(int argc, char **argv, char **const envp) {
   auto CTX = FEXCore::Context::CreateNewContext();
 
   FEXCore::Context::SetCustomCPUBackendFactory(CTX, VMFactory::CPUCreationFactory);
+  FEXCore::Config::SetConfig(CTX, FEXCore::Config::CONFIG_UNIFIED_MEMORY, 0); // ensure TestHarnessRunner doesn't enable UnifiedMemory.
   FEXCore::Config::SetConfig(CTX, FEXCore::Config::CONFIG_DEFAULTCORE, CoreConfig() > 3 ? FEXCore::Config::CONFIG_CUSTOM : CoreConfig());
   FEXCore::Config::SetConfig(CTX, FEXCore::Config::CONFIG_MULTIBLOCK, MultiblockConfig());
   FEXCore::Config::SetConfig(CTX, FEXCore::Config::CONFIG_SINGLESTEP, SingleStepConfig());