diff --git a/libraries/stdlib/test/collections/CollectionTest.kt b/libraries/stdlib/test/collections/CollectionTest.kt
index e667020b1e8..cea31cb58f1 100644
--- a/libraries/stdlib/test/collections/CollectionTest.kt
+++ b/libraries/stdlib/test/collections/CollectionTest.kt
@@ -223,11 +223,9 @@ class CollectionTest {
             list.reduceIndexed { index, a, b -> if (index == 3) a else a + b }
         }
 
-        //        TODO replace with more accurate version when KT-5987 will be fixed
-        //        failsWith(javaClass<UnsupportedOperationException>()) {
-        assertFails {
-            run { arrayListOf<Int>().reduceIndexed { index, a, b -> a + b } }
-        }
+        assertTrue(assertFails {
+            arrayListOf<Int>().reduceIndexed { index, a, b -> a + b }
+        } is UnsupportedOperationException)
     }
 
     @test fun reduceRightIndexed() {
@@ -236,11 +234,9 @@ class CollectionTest {
             list.reduceRightIndexed { index, a, b -> if (index == 0) b else a + b }
         }
 
-        //        TODO replace with more accurate version when KT-5987 will be fixed
-        //        failsWith(javaClass<UnsupportedOperationException>()) {
-        assertFails {
-            run { arrayListOf<Int>().reduceRightIndexed { index, a, b -> a + b } }
-        }
+        assertTrue(assertFails {
+            arrayListOf<Int>().reduceRightIndexed { index, a, b -> a + b }
+        } is UnsupportedOperationException)
     }
 
     @test fun reduce() {
@@ -249,11 +245,9 @@ class CollectionTest {
             list.reduce { a, b -> a + b }
         }
 
-        //        TODO replace with more accurate version when KT-5987 will be fixed
-        //        failsWith(javaClass<UnsupportedOperationException>()) {
-        assertFails {
-            run { arrayListOf<Int>().reduce { a, b -> a + b } }
-        }
+        assertTrue(assertFails {
+            arrayListOf<Int>().reduce { a, b -> a + b }
+        } is UnsupportedOperationException)
     }
 
     @test fun reduceRight() {
@@ -262,11 +256,9 @@ class CollectionTest {
             list.reduceRight { a, b -> a + b }
         }
 
-        //        TODO replace with more accurate version when KT-5987 will be fixed
-        //        failsWith(javaClass<UnsupportedOperationException>()) {
-        assertFails {
-            run { arrayListOf<Int>().reduceRight { a, b -> a + b } }
-        }
+        assertTrue(assertFails {
+            arrayListOf<Int>().reduceRight { a, b -> a + b }
+        } is UnsupportedOperationException)
     }
 
     @test fun groupBy() {