diff --git a/Solver/eigenSolver.h b/Solver/eigenSolver.h
index d4c9394d81111199c364b12c2d0db27cc28dec4f..677e35a582ad45310998318dc17fa0e1f2101e75 100644
--- a/Solver/eigenSolver.h
+++ b/Solver/eigenSolver.h
@@ -41,9 +41,10 @@ class eigenSolver{
  public:
   eigenSolver(dofManager<double> *manager, std::string A, 
               std::string B="", bool hermitian=false){}
-  void solve(int numEigenValues=0, std::string which="")
+  bool solve(int numEigenValues=0, std::string which="")
   {
     Msg::Error("Eigen solver requires SLEPc");
+    return false;
   }
   int getNumEigenValues(){ return 0; }
   std::complex<double> getEigenValue(int num){ return 0.; }