diff --git a/arch/arm/syscall_arch.h b/arch/arm/syscall_arch.h
index 1d87fae1..e10748a4 100644
--- a/arch/arm/syscall_arch.h
+++ b/arch/arm/syscall_arch.h
@@ -3,6 +3,8 @@
 ((union { long long ll; long l[2]; }){ .ll = x }).l[1]
 #define __SYSCALL_LL_O(x) 0, __SYSCALL_LL_E((x))
 
+long (__syscall)(long, ...);
+
 #ifndef __clang__
 
 #define __asm_syscall(...) do { \
diff --git a/arch/microblaze/syscall_arch.h b/arch/microblaze/syscall_arch.h
index 231bed42..70217ffa 100644
--- a/arch/microblaze/syscall_arch.h
+++ b/arch/microblaze/syscall_arch.h
@@ -3,6 +3,8 @@
 ((union { long long ll; long l[2]; }){ .ll = x }).l[1]
 #define __SYSCALL_LL_O(x) 0, __SYSCALL_LL_E((x))
 
+long (__syscall)(long, ...);
+
 #ifndef __clang__
 
 static __inline long __syscall0(long n)
diff --git a/arch/mips/syscall_arch.h b/arch/mips/syscall_arch.h
index 43404c9e..c52976eb 100644
--- a/arch/mips/syscall_arch.h
+++ b/arch/mips/syscall_arch.h
@@ -3,6 +3,8 @@
 ((union { long long ll; long l[2]; }){ .ll = x }).l[1]
 #define __SYSCALL_LL_O(x) 0, __SYSCALL_LL_E((x))
 
+long (__syscall)(long, ...);
+
 #ifndef __clang__
 
 #define __asm_syscall(...) do { \