diff --git a/compiler/tests-common/tests/org/jetbrains/kotlin/codegen/forTestCompile/ForTestCompileRuntime.java b/compiler/tests-common/tests/org/jetbrains/kotlin/codegen/forTestCompile/ForTestCompileRuntime.java
index 3986c958749..240b6a13da0 100644
--- a/compiler/tests-common/tests/org/jetbrains/kotlin/codegen/forTestCompile/ForTestCompileRuntime.java
+++ b/compiler/tests-common/tests/org/jetbrains/kotlin/codegen/forTestCompile/ForTestCompileRuntime.java
@@ -20,8 +20,6 @@ public class ForTestCompileRuntime {
     private static volatile SoftReference<ClassLoader> reflectJarClassLoader = new SoftReference<>(null);
     private static volatile SoftReference<ClassLoader> runtimeJarClassLoader = new SoftReference<>(null);
     private static volatile SoftReference<ClassLoader> coroutinesJarClassLoader = new SoftReference<>(null);
-    private static volatile SoftReference<ClassLoader> unsignedTypesJarClassLoader = new SoftReference<>(null);
-    private static volatile SoftReference<ClassLoader> unsignedTypesAndReflectJarClassLoader = new SoftReference<>(null);
     private static volatile SoftReference<ClassLoader> coroutinesAndReflectJarClassLoader = new SoftReference<>(null);
 
     @NotNull
@@ -34,11 +32,6 @@ public class ForTestCompileRuntime {
         return assertExists(new File("dist/kotlin-stdlib-coroutines.jar"));
     }
 
-    @NotNull
-    public static File unsignedTypesJarForTests() {
-        return assertExists(new File("dist/kotlin-stdlib-unsigned.jar"));
-    }
-
     @NotNull
     public static File minimalRuntimeJarForTests() {
         return assertExists(new File("dist/kotlin-stdlib-minimal-for-test.jar"));
diff --git a/libraries/stdlib/jvm/build.gradle b/libraries/stdlib/jvm/build.gradle
index 7d0c3385467..6f78a6ef612 100644
--- a/libraries/stdlib/jvm/build.gradle
+++ b/libraries/stdlib/jvm/build.gradle
@@ -47,8 +47,6 @@ sourceSets {
             srcDir 'java9'
         }
     }
-    unsigned {
-    }
 }
 
 configurations {
@@ -68,8 +66,6 @@ dependencies {
 
     coroutinesTestCompile sourceSets.coroutines.output
     coroutinesTestCompile project(':kotlin-test:kotlin-test-junit')
-
-    unsignedCompile sourceSets.main.output
 }
 
 jar {
@@ -77,7 +73,6 @@ jar {
     from("${rootDir}/dist/builtins")
     from sourceSets.experimental.output
     from sourceSets.coroutines.output
-    from sourceSets.unsigned.output
     // TODO: enable as soon as this doesn't cause D8/DX to crash
     // from sourceSets.java9.output
 }
@@ -89,13 +84,6 @@ task coroutinesJar(type: Jar) {
     project.configure(manifest) { attributes 'Kotlin-Version': '1.3' }
 }
 
-task unsignedJar(type: Jar) {
-    version = null
-    classifier = 'unsigned'
-    manifestAttributes(manifest, project, 'Main')
-    project.configure(manifest) { attributes 'Kotlin-Version': '1.3' }
-}
-
 sourcesJar {
     from "${rootDir}/core/builtins/native"
     from sourceSets.coroutines.kotlin
@@ -153,7 +141,6 @@ dist {
 
 task experimentalJarsDist(type: Copy) {
     from coroutinesJar
-    from unsignedJar
     into distDir
 }
 
@@ -238,18 +225,6 @@ task coroutinesTest(type: Test, dependsOn: coroutinesTestClasses) {
 
 check.dependsOn(coroutinesTest)
 
-compileUnsignedKotlin {
-    kotlinOptions {
-        languageVersion = "1.3"
-        apiVersion = "1.3"
-        freeCompilerArgs += [
-                "-Xuse-experimental=kotlin.Experimental",
-                "-Xuse-experimental=kotlin.ExperimentalUnsignedTypes",
-                "-XXLanguage:+InlineClasses"
-        ]
-    }
-}
-
 compileTestKotlin {
     kotlinOptions {
         freeCompilerArgs += [