diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index d61838e..1d010f7 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -145,6 +145,7 @@
 #define __NR_sys_rt_sigqueueinfo __NR_rt_sigqueueinfo
 #define __NR_sys_syslog __NR_syslog
 #define __NR_sys_tgkill __NR_tgkill
+#define __NR_sys_tkill __NR_tkill
 
 #if defined(__alpha__) || defined (__ia64__) || defined(__x86_64__)
 #define __NR__llseek __NR_lseek
@@ -165,7 +166,12 @@
           loff_t *, res, uint, wh);
 _syscall3(int,sys_rt_sigqueueinfo,int,pid,int,sig,siginfo_t *,uinfo)
 _syscall3(int,sys_syslog,int,type,char*,bufp,int,len)
+#ifdef TARGET_NR_tgkill
 _syscall3(int,sys_tgkill,int,tgid,int,pid,int,sig)
+#endif
+#ifdef TARGET_NR_tkill
+_syscall2(int,sys_tkill,int,tid,int,sig)
+#endif
 #ifdef __NR_exit_group
 _syscall1(int,exit_group,int,error_code)
 #endif
@@ -4613,6 +4619,12 @@
       break;
 #endif
 
+#ifdef TARGET_NR_tkill
+    case TARGET_NR_tkill:
+        ret = get_errno(sys_tkill((int)arg1, (int)arg2));
+        break;
+#endif
+
 #ifdef TARGET_NR_tgkill
     case TARGET_NR_tgkill:
 	ret = get_errno(sys_tgkill((int)arg1, (int)arg2, (int)arg3));