diff --git a/compiler/integration-tests/src/org/jetbrains/kotlin/AntTaskTest.java b/compiler/integration-tests/src/org/jetbrains/kotlin/AntTaskTest.java
index 0ef274ca717..8e7e1b6aedb 100644
--- a/compiler/integration-tests/src/org/jetbrains/kotlin/AntTaskTest.java
+++ b/compiler/integration-tests/src/org/jetbrains/kotlin/AntTaskTest.java
@@ -29,7 +29,7 @@ public class AntTaskTest extends KotlinIntegrationTestBase {
         String runtime = new File("dist/kotlinc/lib/kotlin-runtime.jar").getAbsolutePath();
 
         assertEquals("compilation failed", 0, runAnt("build.log", "build.xml"));
-        runJava("hello.run", "-cp", jar + ":" + runtime, "Hello.namespace");
+        runJava("hello.run", "-cp", jar + File.pathSeparator + runtime, "Hello.namespace");
     }
 
     @Override