diff --git a/opm/core/pressure/tpfa/ifs_tpfa.c b/opm/core/pressure/tpfa/ifs_tpfa.c
index 9563b773..156e7e30 100644
--- a/opm/core/pressure/tpfa/ifs_tpfa.c
+++ b/opm/core/pressure/tpfa/ifs_tpfa.c
@@ -266,10 +266,6 @@ ifs_tpfa_assemble(struct UnstructuredGrid               *G,
                 h->A->sa[j2] -= trans[f];
             }
         }
-
-        if ((F != NULL) && (F->src != NULL)) {
-            h->b[c] += F->src[c];
-        }
     }
 
     is_neumann = 1;
@@ -277,6 +273,12 @@ ifs_tpfa_assemble(struct UnstructuredGrid               *G,
         is_neumann = assemble_bc_contrib(G, F->bc, trans, h);
     }
 
+    if ((F != NULL) && (F->src != NULL)) {
+        for (c = 0; c < G->number_of_cells; c++) {
+            h->b[c] += F->src[c];
+        }
+    }
+
     if (is_neumann) {
         /* Remove zero eigenvalue associated to constant pressure */
         h->A->sa[0] *= 2;