diff --git a/test/test_1st_order_inversion_filter_estimation.jl b/test/test_1st_order_inversion_filter_estimation.jl
index 6653c531..4abac1cd 100644
--- a/test/test_1st_order_inversion_filter_estimation.jl
+++ b/test/test_1st_order_inversion_filter_estimation.jl
@@ -73,8 +73,8 @@ while !isfinite(LPmax) && i < 1000
     Pigeons.sample_iid!(FS2000_lp, replica, pt.shared)
     new_LP = FS2000_lp(replica.state)
     if new_LP > LPmax
-        LPmax = new_LP
-        XMAX  = deepcopy(replica.state)
+        global LPmax = new_LP
+        global XMAX  = deepcopy(replica.state)
     end
     i += 1
 end
diff --git a/test/test_2nd_order_estimation.jl b/test/test_2nd_order_estimation.jl
index 75d28e94..dcb486de 100644
--- a/test/test_2nd_order_estimation.jl
+++ b/test/test_2nd_order_estimation.jl
@@ -59,8 +59,8 @@ while !isfinite(LPmax) && i < 1000
     Pigeons.sample_iid!(FS2000_lp, replica, pt.shared)
     new_LP = FS2000_lp(replica.state)
     if new_LP > LPmax
-        LPmax = new_LP
-        XMAX  = deepcopy(replica.state)
+        global LPmax = new_LP
+        global XMAX  = deepcopy(replica.state)
     end
     i += 1
 end
diff --git a/test/test_3rd_order_estimation.jl b/test/test_3rd_order_estimation.jl
index 3a4632a3..c8ead811 100644
--- a/test/test_3rd_order_estimation.jl
+++ b/test/test_3rd_order_estimation.jl
@@ -78,8 +78,8 @@ while !isfinite(LPmax) && i < 1000
     Pigeons.sample_iid!(Caldara_lp, replica, pt.shared)
     new_LP = Caldara_lp(replica.state)
     if new_LP > LPmax
-        LPmax = new_LP
-        XMAX  = deepcopy(replica.state)
+        global LPmax = new_LP
+        global XMAX  = deepcopy(replica.state)
     end
     i += 1
 end