diff --git a/afterburner-java/src/main/java/io/perfana/afterburner/controller/CpuBurner.java b/afterburner-java/src/main/java/io/perfana/afterburner/controller/CpuBurner.java
index 77bef70..f555979 100644
--- a/afterburner-java/src/main/java/io/perfana/afterburner/controller/CpuBurner.java
+++ b/afterburner-java/src/main/java/io/perfana/afterburner/controller/CpuBurner.java
@@ -41,8 +41,8 @@ public BurnerMessage magicIdentityCheck(
 
         long startTime = System.currentTimeMillis();
 
-        // some variation: is more fun!
-        int funSize = (int) (matrixSize * (1.0 + (random.nextDouble() * 3.3)));
+        // no variation: is no fun!
+        int funSize = matrixSize;
 
         log.info("Calculate magic matrix identity for matrix size [{}].", funSize);