diff --git a/examples/src/main/kotlin/space/kscience/kmath/tensors/LevenbergMarquardt/StreamingLm/streamLm.kt b/examples/src/main/kotlin/space/kscience/kmath/tensors/LevenbergMarquardt/StreamingLm/streamLm.kt
index fe96b2fe9..f052279ae 100644
--- a/examples/src/main/kotlin/space/kscience/kmath/tensors/LevenbergMarquardt/StreamingLm/streamLm.kt
+++ b/examples/src/main/kotlin/space/kscience/kmath/tensors/LevenbergMarquardt/StreamingLm/streamLm.kt
@@ -16,7 +16,7 @@ import space.kscience.kmath.tensors.core.levenbergMarquardt
 import kotlin.random.Random
 import kotlin.reflect.KFunction3
 
-fun streamLm(lm_func: KFunction3<MutableStructure2D<Double>, MutableStructure2D<Double>, Int, MutableStructure2D<Double>>,
+fun streamLm(lm_func: (MutableStructure2D<Double>, MutableStructure2D<Double>, Int) -> (MutableStructure2D<Double>),
              startData: StartDataLm, launchFrequencyInMs: Long, numberOfLaunches: Int): Flow<MutableStructure2D<Double>> = flow{
 
     var example_number = startData.example_number
diff --git a/kmath-tensors/src/commonMain/kotlin/space/kscience/kmath/tensors/core/LevenbergMarquardtAlgorithm.kt b/kmath-tensors/src/commonMain/kotlin/space/kscience/kmath/tensors/core/LevenbergMarquardtAlgorithm.kt
index d9c282fb6..3cb485d7d 100644
--- a/kmath-tensors/src/commonMain/kotlin/space/kscience/kmath/tensors/core/LevenbergMarquardtAlgorithm.kt
+++ b/kmath-tensors/src/commonMain/kotlin/space/kscience/kmath/tensors/core/LevenbergMarquardtAlgorithm.kt
@@ -88,7 +88,7 @@ public data class LMResultInfo (
  *  exampleNumber: a parameter for a function with which you can choose its behavior.
  */
 public data class LMInput (
-    var func: KFunction3<MutableStructure2D<Double>, MutableStructure2D<Double>, Int, MutableStructure2D<Double>>,
+    var func: (MutableStructure2D<Double>, MutableStructure2D<Double>, Int) -> (MutableStructure2D<Double>),
     var startParameters: MutableStructure2D<Double>,
     var independentVariables: MutableStructure2D<Double>,
     var realValues: MutableStructure2D<Double>,