diff --git a/kmath-stat/src/commonMain/kotlin/space/kscience/kmath/series/EmpiricalModeDecomposition.kt b/kmath-stat/src/commonMain/kotlin/space/kscience/kmath/series/EmpiricalModeDecomposition.kt
index 301247698..ea8a0aa62 100644
--- a/kmath-stat/src/commonMain/kotlin/space/kscience/kmath/series/EmpiricalModeDecomposition.kt
+++ b/kmath-stat/src/commonMain/kotlin/space/kscience/kmath/series/EmpiricalModeDecomposition.kt
@@ -196,16 +196,12 @@ private fun <BA> SeriesAlgebra<Double, *, BA, *>.relativeDifference(
         .div(previous pow 2)
         .fold(0.0) { acc, d -> acc + d } // TODO replace with Series<>.sum() method when it's implemented
 
-private fun <T: Comparable<T>> isExtreme(prev: T, elem: T, next: T): Boolean =
-    (elem > prev && elem > next) || (elem < prev && elem < next)
-
 /**
  * Brute force count all extrema of a series.
  */
-@Deprecated("Does not match the algorithm currently in use.")
 private fun Series<Double>.countExtrema(): Int {
     require(size >= 3) { "Expected series with at least 3 elements, but got $size elements" }
-    return (1 .. size - 2).count { isExtreme(this[it - 1], this[it], this[it + 1]) }
+    return peaks().size + troughs().size
 }
 
 /**