diff --git a/llvm/lib/Support/Unix/Threading.inc b/llvm/lib/Support/Unix/Threading.inc
index c7b4c7af3b9f3..aedcd9aa34b99 100644
--- a/llvm/lib/Support/Unix/Threading.inc
+++ b/llvm/lib/Support/Unix/Threading.inc
@@ -141,7 +141,7 @@ uint64_t llvm::get_threadid() {
 #elif defined(__ANDROID__)
   return uint64_t(gettid());
 #elif defined(__linux__)
-  return uint64_t(syscall(SYS_gettid));
+  return uint64_t(syscall(__NR_gettid));
 #else
   return uint64_t(pthread_self());
 #endif