diff --git a/applications/solvers/foamMultiRun/regionSolvers/regionSolvers.C b/applications/solvers/foamMultiRun/regionSolvers/regionSolvers.C
index 810564904f..e45390648c 100644
--- a/applications/solvers/foamMultiRun/regionSolvers/regionSolvers.C
+++ b/applications/solvers/foamMultiRun/regionSolvers/regionSolvers.C
@@ -24,6 +24,7 @@ License
 \*---------------------------------------------------------------------------*/
 
 #include "regionSolvers.H"
+#include "solver.H"
 #include "Time.H"
 
 // * * * * * * * * * * * * * * * * Constructors  * * * * * * * * * * * * * * //