diff --git a/src/backend/core/MMIO.hpp b/src/backend/core/MMIO.hpp
index c407a477..32864f1b 100644
--- a/src/backend/core/MMIO.hpp
+++ b/src/backend/core/MMIO.hpp
@@ -15,7 +15,7 @@ struct Mem;
 struct Registers;
 
 struct MMIO {
-  MMIO(Mem& mem, Registers& regs, ParallelRDP& parallel) : vi(mem, regs), mi(regs), ai(mem, regs), pi(mem, regs), si(mem, regs), rsp(mem, regs), rdp(mem, regs, parallel) {}
+  MMIO(Mem& mem, Registers& regs, ParallelRDP& parallel) : vi(mem, regs), mi(regs), ai(mem, regs), pi(mem, regs), si(mem, regs), rsp(mem, regs), rdp(mem, parallel) {}
   void Reset();
 
   VI vi;
diff --git a/src/backend/core/RDP.cpp b/src/backend/core/RDP.cpp
index ffd7150e..673fe7a3 100644
--- a/src/backend/core/RDP.cpp
+++ b/src/backend/core/RDP.cpp
@@ -5,7 +5,7 @@
 #include <core/mmio/Interrupt.hpp>
 
 namespace n64 {
-RDP::RDP(Mem& mem, Registers& regs, ParallelRDP& parallel) : mem(mem), regs(regs), parallel(parallel) {
+RDP::RDP(Mem& mem, ParallelRDP& parallel) : mem(mem), parallel(parallel) {
   rdram.resize(RDRAM_SIZE);
   memset(cmd_buf, 0, 0x100000);
   dpc.status.raw = 0x80;
diff --git a/src/backend/core/RDP.hpp b/src/backend/core/RDP.hpp
index fb4b3062..8cafac93 100644
--- a/src/backend/core/RDP.hpp
+++ b/src/backend/core/RDP.hpp
@@ -56,7 +56,7 @@ struct RDP {
   DPC dpc{};
   u32 cmd_buf[0xFFFFF]{};
 
-  RDP(Mem&, Registers&, ParallelRDP&);
+  RDP(Mem&, ParallelRDP&);
   void Reset();
 
   std::vector<u8> rdram{};
@@ -83,7 +83,6 @@ struct RDP {
   }
 private:
   Mem& mem;
-  Registers& regs;
   ParallelRDP& parallel;
 };
 } // backend