diff --git a/src/lib/utils/thread.cpp b/src/lib/utils/thread.cpp
index bc428d8c..8df01504 100644
--- a/src/lib/utils/thread.cpp
+++ b/src/lib/utils/thread.cpp
@@ -20,6 +20,10 @@
 #  include <config.h>
 #endif
 
+#ifdef HAVE_PTHREAD_SETNAME_NP
+#  define _GNU_SOURCE
+#endif
+
 #include "lib/utils/thread.h"
 #include "lib/utils/clock.h"