diff --git a/regtest/multicolvar/rt-link/main.cpp b/regtest/multicolvar/rt-link/main.cpp
index 9e4dbb97e33a752270add0b8250dcca8e1840cba..3ae30f30bc8249e9312d4a6a096af1d19b4289ae 100644
--- a/regtest/multicolvar/rt-link/main.cpp
+++ b/regtest/multicolvar/rt-link/main.cpp
@@ -1,7 +1,9 @@
+#include "mpi.h"
+#include "plumed/tools/Communicator.h"
+#include "plumed/tools/Tools.h"
 #include "plumed/tools/Vector.h"
 #include "plumed/tools/LinkCells.h"
 #include "plumed/tools/Pbc.h"
-#include "plumed/tools/Communicator.h"
 #include <fstream>
 #include <iostream>