diff --git a/agama/engine/src/test/java/io/jans/agama/test/MathFlowTest.java b/agama/engine/src/test/java/io/jans/agama/test/MathFlowTest.java
index 387965048de..3a4754a4c48 100644
--- a/agama/engine/src/test/java/io/jans/agama/test/MathFlowTest.java
+++ b/agama/engine/src/test/java/io/jans/agama/test/MathFlowTest.java
@@ -25,7 +25,7 @@ public void runEmpty() {
     @Test
     public void runRandom() {
         
-        int len = (int) (Math.random() * 10);
+        int len = (int) (1 + Math.random() * 10);
         List<Integer> list = new ArrayList<>();
         
         for (int i = 0; i < len; i++) {