diff --git a/src/runtime/defs_linux_loong64.go b/src/runtime/defs_linux_loong64.go
index 3e0fac0298..dda4009fb0 100644
--- a/src/runtime/defs_linux_loong64.go
+++ b/src/runtime/defs_linux_loong64.go
@@ -10,7 +10,6 @@ const (
 	_EINTR  = 0x4
 	_EAGAIN = 0xb
 	_ENOMEM = 0xc
-	_ENOSYS = 0x26
 
 	_PROT_NONE  = 0x0
 	_PROT_READ  = 0x1
diff --git a/src/runtime/sys_linux_loong64.s b/src/runtime/sys_linux_loong64.s
index 07628ba499..36a92df87c 100644
--- a/src/runtime/sys_linux_loong64.s
+++ b/src/runtime/sys_linux_loong64.s
@@ -107,15 +107,6 @@ TEXT runtime·read(SB),NOSPLIT|NOFRAME,$0-28
 	MOVW	R4, ret+24(FP)
 	RET
 
-// func pipe() (r, w int32, errno int32)
-TEXT runtime·pipe(SB),NOSPLIT|NOFRAME,$0-12
-	MOVV	$r+0(FP), R4
-	MOVV	R0, R5
-	MOVV	$SYS_pipe2, R11
-	SYSCALL
-	MOVW	R4, errno+8(FP)
-	RET
-
 // func pipe2(flags int32) (r, w int32, errno int32)
 TEXT runtime·pipe2(SB),NOSPLIT|NOFRAME,$0-20
 	MOVV	$r+8(FP), R4
@@ -591,21 +582,6 @@ TEXT runtime·closeonexec(SB),NOSPLIT|NOFRAME,$0
 	SYSCALL
 	RET
 
-// func runtime·setNonblock(int32 fd)
-TEXT runtime·setNonblock(SB),NOSPLIT|NOFRAME,$0-4
-	MOVW	fd+0(FP), R4 // fd
-	MOVV	$3, R5	// F_GETFL
-	MOVV	$0, R6
-	MOVV	$SYS_fcntl, R11
-	SYSCALL
-	MOVW	$0x800, R6 // O_NONBLOCK
-	OR	R4, R6
-	MOVW	fd+0(FP), R4 // fd
-	MOVV	$4, R5	// F_SETFL
-	MOVV	$SYS_fcntl, R11
-	SYSCALL
-	RET
-
 // func sbrk0() uintptr
 TEXT runtime·sbrk0(SB),NOSPLIT|NOFRAME,$0-8
 	// Implemented as brk(NULL).