diff --git a/Source/Core/Common/Arm64Emitter.cpp b/Source/Core/Common/Arm64Emitter.cpp
index 5801e5ea57..31301c8f05 100644
--- a/Source/Core/Common/Arm64Emitter.cpp
+++ b/Source/Core/Common/Arm64Emitter.cpp
@@ -1010,9 +1010,9 @@ void ARM64XEmitter::SMSUBL(ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm, ARM64Reg Ra)
 {
 	EncodeData3SrcInst(3, Rd, Rn, Rm, Ra);
 }
-void ARM64XEmitter::SMULH(ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm, ARM64Reg Ra)
+void ARM64XEmitter::SMULH(ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm)
 {
-	EncodeData3SrcInst(4, Rd, Rn, Rm, Ra);
+	EncodeData3SrcInst(4, Rd, Rn, Rm, SP);
 }
 void ARM64XEmitter::UMADDL(ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm, ARM64Reg Ra)
 {
@@ -1022,9 +1022,9 @@ void ARM64XEmitter::UMSUBL(ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm, ARM64Reg Ra)
 {
 	EncodeData3SrcInst(6, Rd, Rn, Rm, Ra);
 }
-void ARM64XEmitter::UMULH(ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm, ARM64Reg Ra)
+void ARM64XEmitter::UMULH(ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm)
 {
-	EncodeData3SrcInst(7, Rd, Rn, Rm, Ra);
+	EncodeData3SrcInst(7, Rd, Rn, Rm, SP);
 }
 void ARM64XEmitter::MUL(ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm)
 {
diff --git a/Source/Core/Common/Arm64Emitter.h b/Source/Core/Common/Arm64Emitter.h
index 7cc1d90361..a7c65e4137 100644
--- a/Source/Core/Common/Arm64Emitter.h
+++ b/Source/Core/Common/Arm64Emitter.h
@@ -478,10 +478,10 @@ public:
 	void MSUB(ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm, ARM64Reg Ra);
 	void SMADDL(ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm, ARM64Reg Ra);
 	void SMSUBL(ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm, ARM64Reg Ra);
-	void SMULH(ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm, ARM64Reg Ra);
+	void SMULH(ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm);
 	void UMADDL(ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm, ARM64Reg Ra);
 	void UMSUBL(ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm, ARM64Reg Ra);
-	void UMULH(ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm, ARM64Reg Ra);
+	void UMULH(ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm);
 	void MUL(ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm);
 	void MNEG(ARM64Reg Rd, ARM64Reg Rn, ARM64Reg Rm);