diff --git a/libs/pbd/pbd/downloader.h b/libs/pbd/pbd/downloader.h
index 191bb95ab6..48002896c9 100644
--- a/libs/pbd/pbd/downloader.h
+++ b/libs/pbd/pbd/downloader.h
@@ -21,7 +21,6 @@
 
 #include <atomic>
 #include <string>
-#include <thread>
 
 #include <curl/curl.h>