diff --git a/Source/Project64-rsp/Interpreter CPU.cpp b/Source/Project64-rsp/Interpreter CPU.cpp
index bb2b49f51..0e5e3c26d 100644
--- a/Source/Project64-rsp/Interpreter CPU.cpp	
+++ b/Source/Project64-rsp/Interpreter CPU.cpp	
@@ -55,7 +55,7 @@ void BuildInterpreterCPU(void)
     RSP_Opcode[36] = RSP_Opcode_LBU;
     RSP_Opcode[37] = RSP_Opcode_LHU;
     RSP_Opcode[38] = rsp_UnknownOpcode;
-    RSP_Opcode[39] = rsp_UnknownOpcode;
+    RSP_Opcode[39] = RSP_Opcode_LWU;
     RSP_Opcode[40] = RSP_Opcode_SB;
     RSP_Opcode[41] = RSP_Opcode_SH;
     RSP_Opcode[42] = rsp_UnknownOpcode;
diff --git a/Source/Project64-rsp/Interpreter Ops.cpp b/Source/Project64-rsp/Interpreter Ops.cpp
index 49de9a0cb..24d379970 100644
--- a/Source/Project64-rsp/Interpreter Ops.cpp	
+++ b/Source/Project64-rsp/Interpreter Ops.cpp	
@@ -169,6 +169,12 @@ void RSP_Opcode_LHU(void)
     RSP_GPR[RSPOpC.rt].UW = RSP_GPR[RSPOpC.rt].UHW[0];
 }
 
+void RSP_Opcode_LWU(void)
+{
+    uint32_t Address = (uint32_t)(RSP_GPR[RSPOpC.base].W + (short)RSPOpC.offset) & 0xFFF;
+    RSP_LW_DMEM(Address, &RSP_GPR[RSPOpC.rt].UW);
+}
+
 void RSP_Opcode_SB(void)
 {
     uint32_t Address = (uint32_t)(RSP_GPR[RSPOpC.base].W + (short)RSPOpC.offset) & 0xFFF;
diff --git a/Source/Project64-rsp/Interpreter Ops.h b/Source/Project64-rsp/Interpreter Ops.h
index 7ed05ab83..882f11ea3 100644
--- a/Source/Project64-rsp/Interpreter Ops.h	
+++ b/Source/Project64-rsp/Interpreter Ops.h	
@@ -23,6 +23,7 @@ void RSP_Opcode_LH(void);
 void RSP_Opcode_LW(void);
 void RSP_Opcode_LBU(void);
 void RSP_Opcode_LHU(void);
+void RSP_Opcode_LWU(void);
 void RSP_Opcode_SB(void);
 void RSP_Opcode_SH(void);
 void RSP_Opcode_SW(void);
diff --git a/Source/Project64-rsp/cpu/RSPOpcode.h b/Source/Project64-rsp/cpu/RSPOpcode.h
index f35c70029..1a3fc9d03 100644
--- a/Source/Project64-rsp/cpu/RSPOpcode.h
+++ b/Source/Project64-rsp/cpu/RSPOpcode.h
@@ -94,6 +94,7 @@ enum RSPOpCodes
     RSP_LW = 35,
     RSP_LBU = 36,
     RSP_LHU = 37,
+    RSP_LWU = 39,
     RSP_SB = 40,
     RSP_SH = 41,
     RSP_SW = 43,
diff --git a/Source/Project64-rsp/cpu/RSPiInstruction.cpp b/Source/Project64-rsp/cpu/RSPiInstruction.cpp
index a55f8a7f7..93cc239e2 100644
--- a/Source/Project64-rsp/cpu/RSPiInstruction.cpp
+++ b/Source/Project64-rsp/cpu/RSPiInstruction.cpp
@@ -146,6 +146,10 @@ void RSPInstruction::DecodeName(void)
         strcpy(m_Name, "LHU");
         sprintf(m_Param, "%s, 0x%04X (%s)", GPR_Name(m_Instruction.rt), m_Instruction.offset, GPR_Name(m_Instruction.base));
         break;
+    case RSP_LWU:
+        strcpy(m_Name, "LWU");
+        sprintf(m_Param, "%s, 0x%04X (%s)", GPR_Name(m_Instruction.rt), m_Instruction.offset, GPR_Name(m_Instruction.base));
+        break;
     case RSP_SB:
         strcpy(m_Name, "SB");
         sprintf(m_Param, "%s, 0x%04X (%s)", GPR_Name(m_Instruction.rt), m_Instruction.offset, GPR_Name(m_Instruction.base));