diff --git a/tests/estimation/tune_mh_jscale/fs2000.mod b/tests/estimation/tune_mh_jscale/fs2000.mod
index 402ca68a5..a44fa544a 100644
--- a/tests/estimation/tune_mh_jscale/fs2000.mod
+++ b/tests/estimation/tune_mh_jscale/fs2000.mod
@@ -19,7 +19,7 @@
 
 @#include "fs2000.inc"
 
-estimation(order=1, datafile='../fsdat_simul', nobs=192, loglinear, mh_replic=20000, mh_nblocks=2, mh_tune_jscale=0.33);
+estimation(order=1, datafile='../fsdat_simul', nobs=192, loglinear, mh_replic=10000, mh_nblocks=1, mh_tune_jscale=0.33,mh_tune_guess=0.7,plot_priors=0);
 
 mhdata = load('fs2000/metropolis/fs2000_mh_history_0.mat');
 
diff --git a/tests/gsa/ls2003a.mod b/tests/gsa/ls2003a.mod
index 2f0dc73f2..b096acbc2 100644
--- a/tests/gsa/ls2003a.mod
+++ b/tests/gsa/ls2003a.mod
@@ -97,13 +97,16 @@ y_obs,R_obs(@{ilag}), -; //[ccf]
 y_obs,pie_obs(@{ilag}), -; //[ccf]
 @#endfor
 end;
+
+options_.prior_mc=5000;
+
 prior simulate;
 prior moments(distribution);
 
 if isoctave()
-  dynare_sensitivity(prior_range=0, nodisplay, graph_format=(eps));
+  dynare_sensitivity(prior_range=0, nodisplay, graph_format=(eps),Nsam=1024);
 else
-  dynare_sensitivity(prior_range=0, nodisplay, graph_format=(fig));
+  dynare_sensitivity(prior_range=0, nodisplay, graph_format=(fig),Nsam=1024);
 end
 
 /*