diff --git a/.idea/kotlinc.xml b/.idea/kotlinc.xml
index 1010bfbd321..3037d602f3b 100644
--- a/.idea/kotlinc.xml
+++ b/.idea/kotlinc.xml
@@ -13,6 +13,6 @@
     </option>
   </component>
   <component name="KotlinCompilerSettings">
-    <option name="additionalArguments" value="-version -Xallow-kotlin-package -Xskip-metadata-version-check" />
+    <option name="additionalArguments" value="-version -Xallow-kotlin-package -Xskip-metadata-version-check -Xread-deserialized-contracts" />
   </component>
 </project>
\ No newline at end of file
diff --git a/build.gradle.kts b/build.gradle.kts
index 76a1e820950..2684f0acf33 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -145,6 +145,7 @@ fun Project.getBooleanProperty(name: String): Boolean? = this.findProperty(name)
 
 val isTeamcityBuild = project.hasProperty("teamcity") || System.getenv("TEAMCITY_VERSION") != null
 val intellijUltimateEnabled = project.getBooleanProperty("intellijUltimateEnabled") ?: isTeamcityBuild
+val effectSystemEnabled by extra(project.getBooleanProperty("kotlin.compiler.effectSystemEnabled") ?: false)
 
 val intellijSeparateSdks = project.getBooleanProperty("intellijSeparateSdks") ?: false
 
@@ -291,7 +292,7 @@ allprojects {
     }
     configureJvmProject(javaHome!!, jvmTarget!!)
 
-    val commonCompilerArgs = listOf("-Xallow-kotlin-package")
+    val commonCompilerArgs = listOf("-Xallow-kotlin-package", "-Xread-deserialized-contracts")
 
     tasks.withType<org.jetbrains.kotlin.gradle.dsl.KotlinCompile<*>> {
         kotlinOptions {
diff --git a/compiler/build.gradle.kts b/compiler/build.gradle.kts
index 8edd894a06e..58bbb36f50d 100644
--- a/compiler/build.gradle.kts
+++ b/compiler/build.gradle.kts
@@ -1,6 +1,7 @@
 
 import java.io.File
 import org.gradle.api.tasks.bundling.Jar
+import org.jetbrains.kotlin.gradle.dsl.KotlinCompile
 
 apply { plugin("kotlin") }
 
@@ -9,6 +10,18 @@ jvmTarget = "1.6"
 val compilerModules: Array<String> by rootProject.extra
 val otherCompilerModules = compilerModules.filter { it != path }
 
+val effectSystemEnabled: Boolean by rootProject.extra
+if (effectSystemEnabled) {
+    allprojects {
+        tasks.withType<KotlinCompile<*>> {
+            kotlinOptions {
+                freeCompilerArgs += listOf("-Xeffect-system")
+            }
+        }
+    }
+}
+
+
 val depDistProjects = listOf(
         ":kotlin-script-runtime",
         ":kotlin-stdlib",
diff --git a/gradle.properties b/gradle.properties
index 9f199e11d27..b05f7d6849e 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -4,6 +4,7 @@ org.gradle.configureondemand=false
 org.gradle.jvmargs=-Duser.country=US -Dkotlin.daemon.jvm.options=-Xmx1600m
 
 kotlin.incremental.usePreciseJavaTracking=true
+kotlin.compiler.effectSystemEnabled=true
 #bootstrap.kotlin.repo=https://dl.bintray.com/kotlin/kotlin-dev
 #bootstrap.kotlin.version=1.1.50-dev-1451
 #signingRequired=true