diff --git a/tests/unittests/tools/stub_http_upload.c b/tests/unittests/tools/stub_http_upload.c
index 508d3f8b..59a7bace 100644
--- a/tests/unittests/tools/stub_http_upload.c
+++ b/tests/unittests/tools/stub_http_upload.c
@@ -2,6 +2,7 @@
 #define TOOLS_HTTP_UPLOAD_H
 
 #include <curl/curl.h>
+#include <pthread.h>
 
 // forward -> ui/win_types.h
 typedef struct prof_win_t ProfWin;