diff --git a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/diagnosticsRenderingSmoke/expectedOutput.txt b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/diagnosticsRenderingSmoke/expectedOutput.txt
index 21d7cf787d3..7850e0d1635 100644
--- a/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/diagnosticsRenderingSmoke/expectedOutput.txt
+++ b/libraries/tools/kotlin-gradle-plugin-integration-tests/src/test/resources/testProject/diagnosticsRenderingSmoke/expectedOutput.txt
@@ -6,7 +6,7 @@ kotlin.mpp.enableCompatibilityMetadataVariant, kotlin.mpp.hierarchicalStructureS
 Read the details here: https://kotlinlang.org/docs/multiplatform-compatibility-guide.html#deprecate-hmpp-properties
 #diagnostic-end
 
-w: [CommonMainWithDependsOnDiagnostic | WARNING] commonMain can't declare dependsOn on other source sets
+e: [CommonMainWithDependsOnDiagnostic | ERROR] commonMain can't declare dependsOn on other source sets
 #diagnostic-end
 
 w: [KotlinDefaultHierarchyFallbackDependsOnUsageDetected | WARNING] The Default Kotlin Hierarchy was not applied to 'project ':subprojectA'':
@@ -20,7 +20,7 @@ to your gradle.properties
 
 
 > Configure project :subprojectB
-w: [CommonMainWithDependsOnDiagnostic | WARNING] commonMain can't declare dependsOn on other source sets
+e: [CommonMainWithDependsOnDiagnostic | ERROR] commonMain can't declare dependsOn on other source sets
 #diagnostic-end
 
 w: [KotlinDefaultHierarchyFallbackDependsOnUsageDetected | WARNING] The Default Kotlin Hierarchy was not applied to 'project ':subprojectB'':
diff --git a/libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/plugin/diagnostics/KotlinToolingDiagnostics.kt b/libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/plugin/diagnostics/KotlinToolingDiagnostics.kt
index bddfb982337..729ea3b6095 100644
--- a/libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/plugin/diagnostics/KotlinToolingDiagnostics.kt
+++ b/libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/plugin/diagnostics/KotlinToolingDiagnostics.kt
@@ -35,7 +35,7 @@ object KotlinToolingDiagnostics {
         )
     }
 
-    object CommonMainWithDependsOnDiagnostic : ToolingDiagnosticFactory(WARNING) {
+    object CommonMainWithDependsOnDiagnostic : ToolingDiagnosticFactory(ERROR) {
         operator fun invoke() = build("commonMain can't declare dependsOn on other source sets")
     }
 
diff --git a/libraries/tools/kotlin-gradle-plugin/src/functionalTest/resources/expectedDiagnostics/commonMainWithDependsOn.txt b/libraries/tools/kotlin-gradle-plugin/src/functionalTest/resources/expectedDiagnostics/commonMainWithDependsOn.txt
index c350fd3a88e..a1f4e4085ad 100644
--- a/libraries/tools/kotlin-gradle-plugin/src/functionalTest/resources/expectedDiagnostics/commonMainWithDependsOn.txt
+++ b/libraries/tools/kotlin-gradle-plugin/src/functionalTest/resources/expectedDiagnostics/commonMainWithDependsOn.txt
@@ -1 +1 @@
-[CommonMainWithDependsOnDiagnostic | WARNING] commonMain can't declare dependsOn on other source sets
+[CommonMainWithDependsOnDiagnostic | ERROR] commonMain can't declare dependsOn on other source sets