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 0d6200bcc..fa6ac7729 100644
--- a/tools/devserver/src/main/java/org/teavm/devserver/CodeServlet.java
+++ b/tools/devserver/src/main/java/org/teavm/devserver/CodeServlet.java
@@ -1084,7 +1084,7 @@ public class CodeServlet extends HttpServlet {
                     end = 1000;
                     break;
             }
-            phaseLimit = count;
+            phaseLimit = Math.max(1, count);
             return progressReached(0);
         }