diff --git a/pcsx2/COP0.cpp b/pcsx2/COP0.cpp
index 461aa5bd96..9c6e315c78 100644
--- a/pcsx2/COP0.cpp
+++ b/pcsx2/COP0.cpp
@@ -465,7 +465,7 @@ void MFC0()
 			[[fallthrough]];
 
 		default:
-			cpuRegs.GPR.r[_Rt_].UD[0] = (s64)cpuRegs.CP0.r[_Rd_];
+			cpuRegs.GPR.r[_Rt_].SD[0] = (s32)cpuRegs.CP0.r[_Rd_];
 	}
 }