diff --git a/libc/bionic/pthread.c b/libc/bionic/pthread.c
index b893a12..10fb7b5 100644
--- a/libc/bionic/pthread.c
+++ b/libc/bionic/pthread.c
@@ -1839,7 +1839,7 @@
 }
 
 // man says this should be in <linux/unistd.h>, but it isn't
-extern int tkill(int tid, int sig);
+extern int tgkill(int tgid, int tid, int sig);
 
 int pthread_kill(pthread_t tid, int sig)
 {
@@ -1847,7 +1847,7 @@
     int  old_errno = errno;
     pthread_internal_t * thread = (pthread_internal_t *)tid;
 
-    ret = tkill(thread->kernel_id, sig);
+    ret = tgkill(getpid(), thread->kernel_id, sig);
     if (ret < 0) {
         ret = errno;
         errno = old_errno;