diff --git a/i18n/build.gradle.kts b/i18n/build.gradle.kts
index 542afc359..366e19ad3 100644
--- a/i18n/build.gradle.kts
+++ b/i18n/build.gradle.kts
@@ -38,8 +38,13 @@ multiplatformResources {
 
 tasks {
     val localesConfigTask = registerLocalesConfigTask(project)
-
     preBuild {
         dependsOn(localesConfigTask)
     }
+
+    withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile> {
+        kotlinOptions.freeCompilerArgs += listOf(
+            "-Xexpect-actual-classes",
+        )
+    }
 }
diff --git a/source-api/build.gradle.kts b/source-api/build.gradle.kts
index 020695b6c..f8c78fb19 100644
--- a/source-api/build.gradle.kts
+++ b/source-api/build.gradle.kts
@@ -35,3 +35,11 @@ android {
         consumerProguardFile("consumer-proguard.pro")
     }
 }
+
+tasks {
+    withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile> {
+        kotlinOptions.freeCompilerArgs += listOf(
+            "-Xexpect-actual-classes",
+        )
+    }
+}
diff --git a/source-local/build.gradle.kts b/source-local/build.gradle.kts
index 71d88804c..98eb4d55a 100644
--- a/source-local/build.gradle.kts
+++ b/source-local/build.gradle.kts
@@ -41,6 +41,7 @@ android {
 tasks {
     withType<org.jetbrains.kotlin.gradle.tasks.KotlinCompile> {
         kotlinOptions.freeCompilerArgs += listOf(
+            "-Xexpect-actual-classes",
             "-opt-in=kotlinx.serialization.ExperimentalSerializationApi",
         )
     }