diff --git a/src/shrpx_worker_config.cc b/src/shrpx_worker_config.cc
index f20ac7db..6db91f04 100644
--- a/src/shrpx_worker_config.cc
+++ b/src/shrpx_worker_config.cc
@@ -32,7 +32,10 @@ WorkerConfig::WorkerConfig()
     errorlog_tty(false)
 {}
 
-thread_local WorkerConfig worker_config;
+#ifndef NOTHREADS
+thread_local
+#endif // NOTHREADS
+WorkerConfig worker_config;
 
 } // namespace shrpx
 
diff --git a/src/shrpx_worker_config.h b/src/shrpx_worker_config.h
index 416c67f8..02567d65 100644
--- a/src/shrpx_worker_config.h
+++ b/src/shrpx_worker_config.h
@@ -39,7 +39,11 @@ struct WorkerConfig {
 };
 
 // We need WorkerConfig per thread
-extern thread_local WorkerConfig worker_config;
+extern
+#ifndef NOTHREADS
+thread_local
+#endif // NOTHREADS
+WorkerConfig worker_config;
 
 } // namespace shrpx