diff --git a/sys/posix/pthread/include/pthread_mutex.h b/sys/posix/pthread/include/pthread_mutex.h
index 0b2fea8fb956b..d9d74913303a3 100644
--- a/sys/posix/pthread/include/pthread_mutex.h
+++ b/sys/posix/pthread/include/pthread_mutex.h
@@ -26,6 +26,11 @@
 extern "C" {
 #endif
 
+/**
+ * Static initializer for @ref pthread_mutex_t struct
+ */
+#define PTHREAD_MUTEX_INITIALIZER  MUTEX_INIT;
+
 /**
  * @brief           Pthread mutexes are quite the same as RIOT mutexes.
  * @details         Recursive locking is not supported.