diff --git a/sys/newlib/syscalls.c b/sys/newlib/syscalls.c
index 0f6a0d36f8..70fd9ba5bf 100644
--- a/sys/newlib/syscalls.c
+++ b/sys/newlib/syscalls.c
@@ -113,6 +113,17 @@ int _getpid(void)
     return sched_active_pid;
 }
 
+/**
+ * @brief Get the process-ID of the current thread
+ *
+ * @return      the process ID of the current thread
+ */
+pid_t _getpid_r(struct _reent *ptr)
+{
+    (void) ptr;
+    return sched_active_pid;
+}
+
 /**
  * @brief Send a signal to a given thread
  *