diff --git a/arch/sh/syscall_arch.h b/arch/sh/syscall_arch.h
index 7ee21a56f6e94a643d29a584a4c8516acc9b1920..f63675a81f15667264b5f9e5988c6ef501b16ff2 100644
--- a/arch/sh/syscall_arch.h
+++ b/arch/sh/syscall_arch.h
@@ -8,7 +8,7 @@
  */
 #define __asm_syscall(trapno, ...) do {   \
 	__asm__ __volatile__ (                \
-		"trapa #" #trapno "\n"            \
+		"trapa #31\n"            \
 		"or r0, r0\n"                     \
 		"or r0, r0\n"                     \
 		"or r0, r0\n"                     \
diff --git a/src/internal/sh/syscall.s b/src/internal/sh/syscall.s
index d00712a9702043ff9db9a5b44cd4b9891d82839a..331918a5aaddd0a673606dbb25c2c300d2a83cc7 100644
--- a/src/internal/sh/syscall.s
+++ b/src/internal/sh/syscall.s
@@ -13,7 +13,7 @@ __syscall:
 	mov.l @r15, r7
 	mov.l @(4,r15), r0
 	mov.l @(8,r15), r1
-	trapa #22
+	trapa #31
 	or r0, r0
 	or r0, r0
 	or r0, r0
diff --git a/src/process/sh/vfork.s b/src/process/sh/vfork.s
index 30e173173f7fd455ae3f58d23c13b8cc26abd65b..48cc9396fab26767afc4ff3516ab94965b616ade 100644
--- a/src/process/sh/vfork.s
+++ b/src/process/sh/vfork.s
@@ -7,7 +7,7 @@ vfork:
 	mov #95, r3
 	add r3, r3
 
-	trapa #16
+	trapa #31
 	or    r0, r0
 	or    r0, r0
 	or    r0, r0
diff --git a/src/signal/sh/restore.s b/src/signal/sh/restore.s
index ab26034b5f7f4306049bf6ed98f51933c6fb3d3a..eaedcdfba8577df3c16ce59cd8569ec90bdfb501 100644
--- a/src/signal/sh/restore.s
+++ b/src/signal/sh/restore.s
@@ -2,7 +2,7 @@
 .type   __restore, @function
 __restore:
 	mov   #119, r3  !__NR_sigreturn
-	trapa #16
+	trapa #31
 
 	or    r0, r0
 	or    r0, r0
@@ -15,7 +15,7 @@ __restore:
 __restore_rt:
 	mov   #100, r3  !__NR_rt_sigreturn
 	add   #73, r3
-	trapa #16
+	trapa #31
 
 	or    r0, r0
 	or    r0, r0
diff --git a/src/thread/sh/__unmapself.s b/src/thread/sh/__unmapself.s
index cad91bf60b32041deb471b80f4ff2f6cd8484f9c..0161d53d425da8b9c44ba2bfd678bf9de71770cc 100644
--- a/src/thread/sh/__unmapself.s
+++ b/src/thread/sh/__unmapself.s
@@ -3,7 +3,7 @@
 .type   __unmapself_sh_mmu, @function
 __unmapself_sh_mmu:
 	mov   #91, r3  ! SYS_munmap
-	trapa #18
+	trapa #31
 
 	or    r0, r0
 	or    r0, r0
@@ -13,7 +13,7 @@ __unmapself_sh_mmu:
 
 	mov   #1, r3   ! SYS_exit
 	mov   #0, r4
-	trapa #17
+	trapa #31
 
 	or    r0, r0
 	or    r0, r0
diff --git a/src/thread/sh/clone.s b/src/thread/sh/clone.s
index d6c9184d40ec01f373bdfc91ebd8e737f095fa62..f8ad8451e86674c3c2bc738f67835cf572f88cff 100644
--- a/src/thread/sh/clone.s
+++ b/src/thread/sh/clone.s
@@ -17,7 +17,7 @@ __clone:
 	mov.l @r15,     r6   ! r6 = ptid
 	mov.l @(8,r15), r7   ! r7 = ctid
 	mov.l @(4,r15), r0   ! r0 = tls
-	trapa #21
+	trapa #31
 
 	or r0, r0
 	or r0, r0
@@ -38,7 +38,7 @@ __clone:
 
 	mov   #1, r3   ! __NR_exit
 	mov   r0, r4
-	trapa #17
+	trapa #31
 
 	or   r0, r0
 	or   r0, r0
diff --git a/src/thread/sh/syscall_cp.s b/src/thread/sh/syscall_cp.s
index 6b28ddf05a56c41d456b90b3d93cb156bfe7240a..c3caface8f83ce8f49a777ef65921dd52c626c93 100644
--- a/src/thread/sh/syscall_cp.s
+++ b/src/thread/sh/syscall_cp.s
@@ -31,7 +31,7 @@ L1:	.long __cancel@PLT-(1b-.)
 	mov.l @(4,r15), r7
 	mov.l @(8,r15), r0
 	mov.l @(12,r15), r1
-	trapa #22
+	trapa #31
 
 __cp_end:
 	! work around hardware bug
diff --git a/src/unistd/sh/pipe.s b/src/unistd/sh/pipe.s
index d865ae3afb98876d51368b746ca3217f2b049343..46c4908e7b463bfe5c9888033dc2db8172835d0b 100644
--- a/src/unistd/sh/pipe.s
+++ b/src/unistd/sh/pipe.s
@@ -2,7 +2,7 @@
 .type   pipe, @function
 pipe:
 	mov    #42, r3
-	trapa  #17
+	trapa  #31
 
 	! work around hardware bug
 	or     r0, r0