diff --git a/diktat-cli/build.gradle.kts b/diktat-cli/build.gradle.kts
index 82244c7493..f9addf8d21 100644
--- a/diktat-cli/build.gradle.kts
+++ b/diktat-cli/build.gradle.kts
@@ -64,6 +64,7 @@ tasks.named<ShadowJar>("shadowJar") {
     archiveClassifier.set("")
     manifest {
         attributes["Main-Class"] = "com.saveourtool.diktat.DiktatMainKt"
+        attributes["Multi-Release"] = true
     }
     duplicatesStrategy = DuplicatesStrategy.FAIL
 }
diff --git a/diktat-cli/src/main/kotlin/com/saveourtool/diktat/cli/DiktatProperties.kt b/diktat-cli/src/main/kotlin/com/saveourtool/diktat/cli/DiktatProperties.kt
index 85a6420c60..f3756e6cbb 100644
--- a/diktat-cli/src/main/kotlin/com/saveourtool/diktat/cli/DiktatProperties.kt
+++ b/diktat-cli/src/main/kotlin/com/saveourtool/diktat/cli/DiktatProperties.kt
@@ -46,7 +46,7 @@ data class DiktatProperties(
     val mode: DiktatMode,
     val reporterType: DiktatReporterType,
     val output: String?,
-    private val groupByFileInPlain: Boolean,
+    private val groupByFileInPlain: Boolean?,
     private val colorNameInPlain: String?,
     private val logLevel: Level,
     val patterns: List<String>,
@@ -147,12 +147,12 @@ data class DiktatProperties(
                 shortName = "o",
                 description = "Redirect the reporter output to a file.",
             )
-            val groupByFileInPlain: Boolean by parser.option(
+            val groupByFileInPlain: Boolean? by parser.option(
                 type = ArgType.Boolean,
                 fullName = "plain-group-by-file",
                 shortName = null,
                 description = "A flag for plain reporter"
-            ).default(false)
+            )
             val colorName: String? by parser.colorName(diktatReporterFactory)
             val logLevel: Level by parser.option(
                 type = ArgType.Choice<Level>(),