1 files changed, 1 insertions, 8 deletions
diff --git a/Source/WarpX.H b/Source/WarpX.H
index 4ee7fe47e..450d3a40e 100644
--- a/Source/WarpX.H
+++ b/Source/WarpX.H
@@ -258,14 +258,7 @@ public:
     /** get low-high-low-high-... vector for each direction indicating if mother grid PMLs are enabled */
     std::vector<bool> getPMLdirections() const;
 
-    static amrex::LayoutData<amrex::Real>* getCosts (int lev) {
-        if (m_instance) {
-            return m_instance->costs[lev].get();
-        } else
-        {
-            return nullptr;
-        }
-    }
+    static amrex::LayoutData<amrex::Real>* getCosts (int lev);
 
     static amrex::IntVect filter_npass_each_dir;
     BilinearFilter bilinear_filter;