diff --git a/utbot-framework/src/main/kotlin/org/utbot/engine/UtBotSymbolicEngine.kt b/utbot-framework/src/main/kotlin/org/utbot/engine/UtBotSymbolicEngine.kt
index c5519721a9..fb0ce9855f 100644
--- a/utbot-framework/src/main/kotlin/org/utbot/engine/UtBotSymbolicEngine.kt
+++ b/utbot-framework/src/main/kotlin/org/utbot/engine/UtBotSymbolicEngine.kt
@@ -432,6 +432,8 @@ class UtBotSymbolicEngine(
         val methodUnderTestDescription = FuzzedMethodDescription(methodUnderTest, collectConstantsForFuzzer(graph)).apply {
             compilableName = if (!methodUnderTest.isConstructor) methodUnderTest.name else null
             className = classUnderTest.simpleName
+            canonicalName = classUnderTest.canonicalName
+            isNested = classUnderTest.isNested
             packageName = classUnderTest.packageName
             val names = graph.body.method.tags.filterIsInstance<ParamNamesTag>().firstOrNull()?.names
             parameterNameMap = { index -> names?.getOrNull(index) }
diff --git a/utbot-fuzzers/src/main/kotlin/org/utbot/fuzzer/FuzzedMethodDescription.kt b/utbot-fuzzers/src/main/kotlin/org/utbot/fuzzer/FuzzedMethodDescription.kt
index f81806a752..206c82961a 100644
--- a/utbot-fuzzers/src/main/kotlin/org/utbot/fuzzer/FuzzedMethodDescription.kt
+++ b/utbot-fuzzers/src/main/kotlin/org/utbot/fuzzer/FuzzedMethodDescription.kt
@@ -19,7 +19,6 @@ open class FuzzedMethodDescription(
     val parameters: List<ClassId>,
     val concreteValues: Collection<FuzzedConcreteValue> = emptyList()
 ) {
-
     /**
      * Name that can be used to generate test names
      */
@@ -35,6 +34,16 @@ open class FuzzedMethodDescription(
      */
     var packageName: String? = null
 
+    /**
+     * Canonical name.
+     */
+    var canonicalName: String? = null
+
+    /**
+     * True, if class is nested.
+     */
+    var isNested: Boolean = false
+
     /**
      * Returns parameter name by its index in the signature
      */
diff --git a/utbot-summary/src/main/kotlin/org/utbot/summary/comment/classic/fuzzer/SimpleCommentForTestProducedByFuzzerBuilder.kt b/utbot-summary/src/main/kotlin/org/utbot/summary/comment/classic/fuzzer/SimpleCommentForTestProducedByFuzzerBuilder.kt
index 11f6780246..ee272f2f3a 100644
--- a/utbot-summary/src/main/kotlin/org/utbot/summary/comment/classic/fuzzer/SimpleCommentForTestProducedByFuzzerBuilder.kt
+++ b/utbot-summary/src/main/kotlin/org/utbot/summary/comment/classic/fuzzer/SimpleCommentForTestProducedByFuzzerBuilder.kt
@@ -20,9 +20,11 @@ class SimpleCommentForTestProducedByFuzzerBuilder(
         val packageName = methodDescription.packageName
         val className = methodDescription.className
         val methodName = methodDescription.compilableName
+        val canonicalName = methodDescription.canonicalName
+        val isNested = methodDescription.isNested
 
         val result = if (packageName != null && className != null && methodName != null) {
-            val fullClassName = getFullClassName(packageName, className)
+            val fullClassName = getFullClassName(canonicalName, packageName, className, isNested)
 
             val methodReference = getMethodReferenceForFuzzingTest(
                 fullClassName,
diff --git a/utbot-summary/src/main/kotlin/org/utbot/summary/comment/customtags/CustomTagsUtil.kt b/utbot-summary/src/main/kotlin/org/utbot/summary/comment/customtags/CustomTagsUtil.kt
index fda4050170..5d503461f2 100644
--- a/utbot-summary/src/main/kotlin/org/utbot/summary/comment/customtags/CustomTagsUtil.kt
+++ b/utbot-summary/src/main/kotlin/org/utbot/summary/comment/customtags/CustomTagsUtil.kt
@@ -75,6 +75,10 @@ fun getClassReference(fullClassName: String): String {
 }
 
 /** Returns correct full class name. */
-fun getFullClassName(packageName: String, className: String): String {
-    return if (packageName.isEmpty()) className else "$packageName.$className"
+fun getFullClassName(canonicalName: String?, packageName: String, className: String, isNested: Boolean): String {
+    return if (isNested && canonicalName != null) {
+        canonicalName
+    } else {
+        if (packageName.isEmpty()) className else "$packageName.$className"
+    }
 }
\ No newline at end of file
diff --git a/utbot-summary/src/main/kotlin/org/utbot/summary/comment/customtags/fuzzer/CommentWithCustomTagForTestProducedByFuzzerBuilder.kt b/utbot-summary/src/main/kotlin/org/utbot/summary/comment/customtags/fuzzer/CommentWithCustomTagForTestProducedByFuzzerBuilder.kt
index 0a417eca29..ca65e00a8c 100644
--- a/utbot-summary/src/main/kotlin/org/utbot/summary/comment/customtags/fuzzer/CommentWithCustomTagForTestProducedByFuzzerBuilder.kt
+++ b/utbot-summary/src/main/kotlin/org/utbot/summary/comment/customtags/fuzzer/CommentWithCustomTagForTestProducedByFuzzerBuilder.kt
@@ -5,7 +5,6 @@ import org.utbot.framework.plugin.api.DocStatement
 import org.utbot.framework.plugin.api.UtExecutionResult
 import org.utbot.fuzzer.FuzzedMethodDescription
 import org.utbot.fuzzer.FuzzedValue
-import org.utbot.summary.SummarySentenceConstants.CARRIAGE_RETURN
 import org.utbot.summary.comment.customtags.getClassReference
 import org.utbot.summary.comment.customtags.getFullClassName
 import org.utbot.summary.comment.customtags.getMethodReferenceForFuzzingTest
@@ -34,9 +33,11 @@ class CommentWithCustomTagForTestProducedByFuzzerBuilder(
         val packageName = methodDescription.packageName
         val className = methodDescription.className
         val methodName = methodDescription.compilableName
+        val canonicalName = methodDescription.canonicalName
+        val isNested = methodDescription.isNested
 
         return if (packageName != null && className != null && methodName != null) {
-            val fullClassName = getFullClassName(packageName, className)
+            val fullClassName = getFullClassName(canonicalName, packageName, className, isNested)
 
             val methodReference = getMethodReferenceForFuzzingTest(
                 fullClassName,