diff --git a/utbot-junit-contest/src/main/kotlin/org/utbot/contest/usvm/JcToUtModelConverter.kt b/utbot-junit-contest/src/main/kotlin/org/utbot/contest/usvm/JcToUtModelConverter.kt
index 3f0763f7c6..b0ccdb6fb1 100644
--- a/utbot-junit-contest/src/main/kotlin/org/utbot/contest/usvm/JcToUtModelConverter.kt
+++ b/utbot-junit-contest/src/main/kotlin/org/utbot/contest/usvm/JcToUtModelConverter.kt
@@ -59,7 +59,7 @@ class JcToUtModelConverter(
                 fields += valueDescriptor.fields
                     .entries
                     .associate { (jcField, fieldDescr) ->
-                        val fieldId = FieldId(jcField.type.findClassId(jcClasspath), jcField.name)
+                        val fieldId = FieldId(jcField.enclosingClass.classId, jcField.name)
                         val fieldModel = convert(fieldDescr)
                         fieldId to fieldModel
                     }