diff --git a/src/main/java/de/ellpeck/actuallyadditions/mod/update/ThreadUpdateChecker.java b/src/main/java/de/ellpeck/actuallyadditions/mod/update/ThreadUpdateChecker.java
index c8e10ebeb..9535467f1 100644
--- a/src/main/java/de/ellpeck/actuallyadditions/mod/update/ThreadUpdateChecker.java
+++ b/src/main/java/de/ellpeck/actuallyadditions/mod/update/ThreadUpdateChecker.java
@@ -58,7 +58,7 @@ public class ThreadUpdateChecker extends Thread{
             }
 
             String clientVersionString = ModUtil.VERSION.substring(ModUtil.VERSION.indexOf("r")+1);
-            int clientVersion = Integer.parseInt(clientVersionString.substring(0, clientVersionString.indexOf("_")));
+            int clientVersion = Integer.parseInt(clientVersionString.contains("_") ? clientVersionString.substring(0, clientVersionString.indexOf("_")) : clientVersionString);
             if(UpdateChecker.updateVersionInt > clientVersion){
                 UpdateChecker.needsUpdateNotify = true;
             }