diff --git a/tests/conditional_forecasts/3/fs2000_conditional_forecast_initval.mod b/tests/conditional_forecasts/3/fs2000_conditional_forecast_initval.mod
index 5a061b3e13da6e6c70d05a65f8db7a2903f0e652..4f986280dcdbb9d8c8f4ac9bd20e80bf7ed66091 100644
--- a/tests/conditional_forecasts/3/fs2000_conditional_forecast_initval.mod
+++ b/tests/conditional_forecasts/3/fs2000_conditional_forecast_initval.mod
@@ -63,7 +63,7 @@ steady(tolx=1e-10,tolf=1e-12);
 
 check;
 
-stoch_simul(irf=0);
+stoch_simul(irf=0,order=1);
 
 conditional_forecast_paths;
 var gy_obs;
diff --git a/tests/conditional_forecasts/4/fs2000_conditional_forecast_histval.mod b/tests/conditional_forecasts/4/fs2000_conditional_forecast_histval.mod
index 51433faebb55eeff21ec863ad9b5a655ffa1aec2..3c073b553e12442b260cc04e50437b70915bd161 100644
--- a/tests/conditional_forecasts/4/fs2000_conditional_forecast_histval.mod
+++ b/tests/conditional_forecasts/4/fs2000_conditional_forecast_histval.mod
@@ -61,7 +61,7 @@ steady;
 
 check;
 
-stoch_simul(irf=0);
+stoch_simul(irf=0,order=1);
 
 conditional_forecast_paths;
 var gy_obs;
diff --git a/tests/smoother2histval/fs2000_smooth_stoch_simul.mod b/tests/smoother2histval/fs2000_smooth_stoch_simul.mod
index 587c789d82d66bcea6c4474fa979e01c454c4c05..081ea37b949e216453163890f16055ebd0cadd72 100644
--- a/tests/smoother2histval/fs2000_smooth_stoch_simul.mod
+++ b/tests/smoother2histval/fs2000_smooth_stoch_simul.mod
@@ -87,6 +87,6 @@ steady;
 smoother2histval(period = 5);
 
 options_.loglinear=0;
-stoch_simul(nomoments);
+stoch_simul(nomoments,order=1);
 
 forecast;
diff --git a/tests/stochastic_simulations/histval_predetermined.mod b/tests/stochastic_simulations/histval_predetermined.mod
index 4bfdbc3e97cebfb97444d4519673de55ede8d7b0..372a3c795078d51c5de9b8ef831c873e74e13c36 100644
--- a/tests/stochastic_simulations/histval_predetermined.mod
+++ b/tests/stochastic_simulations/histval_predetermined.mod
@@ -54,6 +54,6 @@ b(0) = 0.1;
 a(0) = 0.3;
 end;
 
-stoch_simul(nograph, periods = 200);
+stoch_simul(nograph, periods = 200,order=1);
 
 forecast;
\ No newline at end of file
diff --git a/tests/stochastic_simulations/histval_sto.mod b/tests/stochastic_simulations/histval_sto.mod
index db4ab3c616b9e5e390dd60726b5a5e86d658baeb..eaffc92c1be4aef8903cf8de4cce7a2f62a92363 100644
--- a/tests/stochastic_simulations/histval_sto.mod
+++ b/tests/stochastic_simulations/histval_sto.mod
@@ -49,7 +49,7 @@ a(-1) = 0.3;
 u(-1) = 0.1;
 end;
 
-stoch_simul(nograph, periods = 200);
+stoch_simul(nograph, periods = 200,order=1);
 
 forecast;