diff --git a/kmath-functions/src/commonMain/kotlin/space/kscience/kmath/integration/GaussIntegrator.kt b/kmath-functions/src/commonMain/kotlin/space/kscience/kmath/integration/GaussIntegrator.kt
index 0038ca0f2..fcf47040e 100644
--- a/kmath-functions/src/commonMain/kotlin/space/kscience/kmath/integration/GaussIntegrator.kt
+++ b/kmath-functions/src/commonMain/kotlin/space/kscience/kmath/integration/GaussIntegrator.kt
@@ -98,7 +98,7 @@ public fun <T : Any> GaussIntegrator<T>.integrate(
     require(intervals > 0) { "Number of intervals must be positive" }
     val rangeSize = (range.endInclusive - range.start) / intervals
     val ranges = UnivariateIntegrandRanges(
-        (0 until intervals).map { i -> (rangeSize * i)..(rangeSize * (i + 1)) to order }
+        (0 until intervals).map { i -> (range.start + rangeSize * i)..(range.start + rangeSize * (i + 1)) to order }
     )
     return integrate(
         UnivariateIntegrand(
diff --git a/kmath-functions/src/commonTest/kotlin/space/kscience/kmath/integration/GaussIntegralTest.kt b/kmath-functions/src/commonTest/kotlin/space/kscience/kmath/integration/GaussIntegralTest.kt
index 1f9f7aedf..6195d0ac6 100644
--- a/kmath-functions/src/commonTest/kotlin/space/kscience/kmath/integration/GaussIntegralTest.kt
+++ b/kmath-functions/src/commonTest/kotlin/space/kscience/kmath/integration/GaussIntegralTest.kt
@@ -24,14 +24,14 @@ class GaussIntegralTest {
 
     @Test
     fun gaussUniform() {
-        val res = DoubleField.integrator.integrate(0.0..100.0) { x ->
+        val res = DoubleField.integrator.integrate(35.0..100.0) { x ->
             if(x in 30.0..50.0){
                 1.0
             } else {
                 0.0
             }
         }
-        assertEquals(20.0, res.valueOrNull!!, 0.5)
+        assertEquals(15.0, res.valueOrNull!!, 0.5)
     }