diff --git a/llvm/lib/Support/Unix/Threading.inc b/llvm/lib/Support/Unix/Threading.inc
index 6301a674df05..b031ff4c0340 100644
--- a/llvm/lib/Support/Unix/Threading.inc
+++ b/llvm/lib/Support/Unix/Threading.inc
@@ -113,6 +113,7 @@ void llvm::set_thread_name(const Twine &Name) {
   // Make sure the input is null terminated.
   SmallString<64> Storage;
   StringRef NameStr = Name.toNullTerminatedStringRef(Storage);
+  (void)NameStr;
 #if defined(__linux__)
 #if (defined(__GLIBC__) && defined(_GNU_SOURCE)) || defined(__ANDROID__)
 #if HAVE_PTHREAD_SETNAME_NP