diff --git a/tools/devserver/src/main/java/org/teavm/devserver/CodeServlet.java b/tools/devserver/src/main/java/org/teavm/devserver/CodeServlet.java
index 7872e5631..74683fb24 100644
--- a/tools/devserver/src/main/java/org/teavm/devserver/CodeServlet.java
+++ b/tools/devserver/src/main/java/org/teavm/devserver/CodeServlet.java
@@ -151,7 +151,7 @@ public class CodeServlet extends HttpServlet {
 
     public CodeServlet(String mainClass, String[] classPath) {
         this.mainClass = mainClass;
-        this.classPath = classSource != null ? classPath.clone() : new String[0];
+        this.classPath = classPath != null ? classPath.clone() : new String[0];
 
         httpClient = new HttpClient();
         httpClient.setFollowRedirects(false);