diff --git a/platform/diff-impl/tests/com/intellij/diff/tools/fragmented/LineNumberConvertorCorrectorTest.kt b/platform/diff-impl/tests/com/intellij/diff/tools/fragmented/LineNumberConvertorCorrectorTest.kt
index 198359ef3ddc..7c2497ecc6aa 100644
--- a/platform/diff-impl/tests/com/intellij/diff/tools/fragmented/LineNumberConvertorCorrectorTest.kt
+++ b/platform/diff-impl/tests/com/intellij/diff/tools/fragmented/LineNumberConvertorCorrectorTest.kt
@@ -16,9 +16,9 @@
 package com.intellij.diff.tools.fragmented
 
 import com.intellij.diff.util.Side
-import com.intellij.testFramework.UsefulTestCase
+import junit.framework.TestCase
 
-class LineNumberConvertorCorrectorTest : UsefulTestCase() {
+class LineNumberConvertorCorrectorTest : TestCase() {
   fun testUnmodified() {
     doTest(
       {
diff --git a/platform/diff-impl/tests/com/intellij/diff/tools/fragmented/LineNumberConvertorTest.kt b/platform/diff-impl/tests/com/intellij/diff/tools/fragmented/LineNumberConvertorTest.kt
index f8562b3cd75c..1382ac3ce571 100644
--- a/platform/diff-impl/tests/com/intellij/diff/tools/fragmented/LineNumberConvertorTest.kt
+++ b/platform/diff-impl/tests/com/intellij/diff/tools/fragmented/LineNumberConvertorTest.kt
@@ -15,9 +15,9 @@
  */
 package com.intellij.diff.tools.fragmented
 
-import com.intellij.testFramework.UsefulTestCase
+import junit.framework.TestCase
 
-class LineNumberConvertorTest : UsefulTestCase() {
+class LineNumberConvertorTest : TestCase() {
   fun testEmpty() {
     doTest(
       {