diff --git a/src/backend_x64/emit_x64.cpp b/src/backend_x64/emit_x64.cpp
index 9625e995..7500dcab 100644
--- a/src/backend_x64/emit_x64.cpp
+++ b/src/backend_x64/emit_x64.cpp
@@ -37,7 +37,7 @@ static IR::Inst* FindUseWithOpcode(IR::Inst* inst, IR::Opcode opcode) {
     return iter == uses.end() ? nullptr : reinterpret_cast<IR::Inst*>(iter->get());
 }
 
-CodePtr EmitX64::Emit(const Arm::LocationDescriptor descriptor, Dynarmic::IR::Block block) {
+CodePtr EmitX64::Emit(const Arm::LocationDescriptor descriptor, const Dynarmic::IR::Block& block) {
     inhibit_emission.clear();
     reg_alloc.Reset();
 
diff --git a/src/backend_x64/emit_x64.h b/src/backend_x64/emit_x64.h
index da19408a..8d5380c1 100644
--- a/src/backend_x64/emit_x64.h
+++ b/src/backend_x64/emit_x64.h
@@ -23,7 +23,7 @@ public:
     EmitX64(Gen::XEmitter* code, Routines* routines, UserCallbacks cb, Jit* jit_interface)
             : reg_alloc(code), code(code), routines(routines), cb(cb), jit_interface(jit_interface) {}
 
-    CodePtr Emit(const Arm::LocationDescriptor descriptor, IR::Block ir);
+    CodePtr Emit(const Arm::LocationDescriptor descriptor, const IR::Block& ir);
 
     CodePtr GetBasicBlock(Arm::LocationDescriptor descriptor) {
         auto iter = basic_blocks.find(descriptor);