diff --git a/kmath-commons/src/test/kotlin/space/kscience/kmath/commons/optimization/OptimizeTest.kt b/kmath-commons/src/test/kotlin/space/kscience/kmath/commons/optimization/OptimizeTest.kt
index 8b4631fca..03b1426f5 100644
--- a/kmath-commons/src/test/kotlin/space/kscience/kmath/commons/optimization/OptimizeTest.kt
+++ b/kmath-commons/src/test/kotlin/space/kscience/kmath/commons/optimization/OptimizeTest.kt
@@ -11,13 +11,13 @@ import space.kscience.kmath.expressions.DSFieldExpression
 import space.kscience.kmath.expressions.Symbol.Companion.x
 import space.kscience.kmath.expressions.Symbol.Companion.y
 import space.kscience.kmath.expressions.autodiff
-import space.kscience.kmath.expressions.chiSquaredExpression
 import space.kscience.kmath.expressions.symbol
 import space.kscience.kmath.misc.UnstableKMathAPI
 import space.kscience.kmath.operations.DoubleBufferOps.Companion.map
 import space.kscience.kmath.operations.DoubleField
 import space.kscience.kmath.optimization.*
 import space.kscience.kmath.random.RandomGenerator
+import space.kscience.kmath.stat.chiSquaredExpression
 import space.kscience.kmath.structures.DoubleBuffer
 import space.kscience.kmath.structures.asBuffer
 import kotlin.test.Test