diff --git a/Source/RSP/Interpreter CPU.c b/Source/RSP/Interpreter CPU.c
index b8647093d..0849ef90d 100644
--- a/Source/RSP/Interpreter CPU.c	
+++ b/Source/RSP/Interpreter CPU.c	
@@ -444,6 +444,7 @@ DWORD RunInterpreterCPU(DWORD Cycles) {
 
 		RSP_LW_IMEM(*PrgCount, &RSPOpC.Hex);
 		RSP_Opcode[ RSPOpC.op ]();
+		RSP_GPR[0].W = 0x00000000; /* MIPS $zero hard-wired to 0 */
 
 		switch (RSP_NextInstruction) {
 		case NORMAL: