diff --git a/kmath-commons/src/test/kotlin/space/kscience/kmath/commons/integration/IntegrationTest.kt b/kmath-commons/src/test/kotlin/space/kscience/kmath/commons/integration/IntegrationTest.kt
index 9d475d04d..97dc94d1d 100644
--- a/kmath-commons/src/test/kotlin/space/kscience/kmath/commons/integration/IntegrationTest.kt
+++ b/kmath-commons/src/test/kotlin/space/kscience/kmath/commons/integration/IntegrationTest.kt
@@ -19,16 +19,16 @@ internal class IntegrationTest {
 
     @Test
     fun simpson() {
-        val res = CMIntegrator.simpson().integrate(0.0..2 * PI, function)
+        val res = CMIntegrator.simpson().integrate(0.0..2 * PI, function = function)
         assertTrue { abs(res) < 1e-3 }
     }
 
     @Test
     fun customSimpson() {
-        val res = CMIntegrator.simpson().integrate(0.0..PI, function) {
+        val res = CMIntegrator.simpson().integrate(0.0..PI, {
             targetRelativeAccuracy = 1e-4
             targetAbsoluteAccuracy = 1e-4
-        }
+        }, function)
         assertTrue { abs(res - 2) < 1e-3 }
         assertTrue { abs(res - 2) > 1e-12 }
     }
diff --git a/kmath-functions/src/commonMain/kotlin/space/kscience/kmath/integration/UnivariateIntegrand.kt b/kmath-functions/src/commonMain/kotlin/space/kscience/kmath/integration/UnivariateIntegrand.kt
index bcd5005c4..51ea57a33 100644
--- a/kmath-functions/src/commonMain/kotlin/space/kscience/kmath/integration/UnivariateIntegrand.kt
+++ b/kmath-functions/src/commonMain/kotlin/space/kscience/kmath/integration/UnivariateIntegrand.kt
@@ -57,8 +57,8 @@ public fun UnivariateIntegrator<Double>.integrate(
 @UnstableKMathAPI
 public fun UnivariateIntegrator<Double>.integrate(
     range: ClosedRange<Double>,
+    featureBuilder: MutableList<IntegrandFeature>.() -> Unit = {},
     function: (Double) -> Double,
-    featureBuilder: (MutableList<IntegrandFeature>.() -> Unit) = {},
 ): Double {
     //TODO use dedicated feature builder class instead or add extensions to MutableList<IntegrandFeature>
     val features = buildList {