diff --git a/unix/asm_linux_loong64.s b/unix/asm_linux_loong64.s
index 6abd48ee..56535728 100644
--- a/unix/asm_linux_loong64.s
+++ b/unix/asm_linux_loong64.s
@@ -30,7 +30,7 @@ TEXT ·SyscallNoError(SB),NOSPLIT,$0-48
 	MOVV	trap+0(FP), R11	// syscall entry
 	SYSCALL
 	MOVV	R4, r1+32(FP)
-	MOVV	R5, r2+40(FP)
+	MOVV	R0, r2+40(FP)	// r2 is not used. Always set to 0
 	JAL	runtime·exitsyscall(SB)
 	RET
 
@@ -50,5 +50,5 @@ TEXT ·RawSyscallNoError(SB),NOSPLIT,$0-48
 	MOVV	trap+0(FP), R11	// syscall entry
 	SYSCALL
 	MOVV	R4, r1+32(FP)
-	MOVV	R5, r2+40(FP)
+	MOVV	R0, r2+40(FP)	// r2 is not used. Always set to 0
 	RET