diff --git a/src/runtime/internal/syscall/asm_linux_loong64.s b/src/runtime/internal/syscall/asm_linux_loong64.s
index ac500fb3b1..d6a33f90a7 100644
--- a/src/runtime/internal/syscall/asm_linux_loong64.s
+++ b/src/runtime/internal/syscall/asm_linux_loong64.s
@@ -24,6 +24,6 @@ TEXT ·Syscall6(SB),NOSPLIT,$0-80
 	RET
 ok:
 	MOVV	R4, r1+56(FP)
-	MOVV	R5, r2+64(FP)
+	MOVV	R0, r2+64(FP)	// r2 is not used. Always set to 0.
 	MOVV	R0, errno+72(FP)
 	RET
diff --git a/src/syscall/asm_linux_loong64.s b/src/syscall/asm_linux_loong64.s
index 2e7d0c7a3e..7dc69c6612 100644
--- a/src/syscall/asm_linux_loong64.s
+++ b/src/syscall/asm_linux_loong64.s
@@ -40,5 +40,5 @@ 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