diff --git a/acc/mhd_solver/stencil_defines.h b/acc/mhd_solver/stencil_defines.h
index 6e22bc9..26e7ffd 100644
--- a/acc/mhd_solver/stencil_defines.h
+++ b/acc/mhd_solver/stencil_defines.h
@@ -78,6 +78,7 @@
 	FUNC(AC_sink_pos_y),\
 	FUNC(AC_sink_pos_z),\
 	FUNC(AC_M_sink),\
+	FUNC(AC_M_sink_init),\
 	FUNC(AC_M_sink_Msun),\
         FUNC(AC_soft),\
         FUNC(AC_accretion_range),\
diff --git a/src/standalone/config_loader.cc b/src/standalone/config_loader.cc
index 95e4796..bee7050 100644
--- a/src/standalone/config_loader.cc
+++ b/src/standalone/config_loader.cc
@@ -150,6 +150,8 @@ update_config(AcMeshInfo* config)
 
     config->real_params[AC_M_sink] = config->real_params[AC_M_sink_Msun] * M_sun / 
 	                             config->real_params[AC_unit_mass];
+    config->real_params[AC_M_sink_init] = config->real_params[AC_M_sink_Msun] * M_sun / 
+	                                  config->real_params[AC_unit_mass];
 
     config->real_params[AC_G_const] = G_CONST_CGS / ((config->real_params[AC_unit_velocity] *
                                                       config->real_params[AC_unit_velocity]) /
diff --git a/src/standalone/simulation.cc b/src/standalone/simulation.cc
index 8159084..b9bf199 100644
--- a/src/standalone/simulation.cc
+++ b/src/standalone/simulation.cc
@@ -240,9 +240,16 @@ run_simulation(void)
     //  acUpdate_sink_particle() will do the similar trick to the device.
 
     /* Step the simulation */
+    AcReal accreted_mass = 0.0;
     for (int i = 1; i < max_steps; ++i) {
         const AcReal umax = acReduceVec(RTYPE_MAX, VTXBUF_UUX, VTXBUF_UUY, VTXBUF_UUZ);
         const AcReal dt   = host_timestep(umax, mesh_info);
+        const AcReal sum_mass = acReduceScal(RTYPE_MAX, VTXBUF_ACCRETION);
+        accreted_mass = accreted_mass + sum_mass;
+        AcReal sink_mass = AC_M_sink_init + accreted_mass;
+        printf("sink mass is: %e\n", sink_mass); 
+        printf("accreted mass is: %e\n", accreted_mass); 
+        acLoadDeviceConstant(AC_M_sink, sink_mass);
 
 #if LFORCING
         const ForcingParams forcing_params = generateForcingParams(mesh_info);