diff --git a/utbot-junit-contest/src/main/kotlin/org/utbot/contest/usvm/jc/JcTestExecutor.kt b/utbot-junit-contest/src/main/kotlin/org/utbot/contest/usvm/jc/JcTestExecutor.kt
index 6d0733a9bb..e91829e419 100644
--- a/utbot-junit-contest/src/main/kotlin/org/utbot/contest/usvm/jc/JcTestExecutor.kt
+++ b/utbot-junit-contest/src/main/kotlin/org/utbot/contest/usvm/jc/JcTestExecutor.kt
@@ -149,10 +149,12 @@ class JcTestExecutor(
         override fun allocateString(value: UTestExpression): UTestExpression = value
 
         override fun resolveObject(ref: UConcreteHeapRef, heapRef: UHeapRef, type: JcClassType): UTestExpression {
-            if (ref !in resolvedMethodMocks) {
+            if (ref !in resolvedMethodMocks || type.jcClass.name != "java.util.Random") {
                 return super.resolveObject(ref, heapRef, type)
             }
 
+            // Hack: mock only Random
+
             val mocks = resolvedMethodMocks.getValue(ref)
 
             val fieldValues = mutableMapOf<JcField, UTestExpression>()