diff --git a/src/incflo.H b/src/incflo.H
index c8b34a27..6e3c5477 100644
--- a/src/incflo.H
+++ b/src/incflo.H
@@ -270,7 +270,7 @@ public:
                           amrex::Real time, amrex::Real scaling_factor, bool incremental);
 
     void ApplyProjection (amrex::Vector<amrex::MultiFab const*> const& density,
-                          amrex::Vector<amrex::MultiFab      *>        vel,
+                          amrex::Vector<amrex::MultiFab      *> const& vel,
                           amrex::Vector<amrex::MultiFab      *> const& divu_Source,
                           amrex::Real time, amrex::Real scaling_factor, bool incremental,
                           bool set_inflow_bc);
diff --git a/src/incflo.cpp b/src/incflo.cpp
index 9e1cee8d..d9beef8b 100644
--- a/src/incflo.cpp
+++ b/src/incflo.cpp
@@ -216,7 +216,7 @@ incflo::ApplyProjection (Vector<MultiFab const*> const& density,
 
 void
 incflo::ApplyProjection (Vector<MultiFab const*> const& density,
-                         Vector<MultiFab      *>        vel,
+                         Vector<MultiFab      *> const& vel,
                          Vector<MultiFab      *> const& divu_Source,
                          Real time, Real scaling_factor, bool incremental,
                          bool set_inflow_bc)