diff --git a/app/src/main/java/com/etesync/syncadapter/Constants.java b/app/src/main/java/com/etesync/syncadapter/Constants.java
index 8517481b..c41bb230 100644
--- a/app/src/main/java/com/etesync/syncadapter/Constants.java
+++ b/app/src/main/java/com/etesync/syncadapter/Constants.java
@@ -36,7 +36,7 @@ public class Constants {
 
     public static final Uri serviceUrl = Uri.parse((DEBUG_REMOTE_URL == null) ? "https://api.etesync.com/" : DEBUG_REMOTE_URL);
 
-    public static final String PRODID_BASE = "-//EteSync//" + BuildConfig.APPLICATION_ID + " " + BuildConfig.VERSION_NAME;
+    public static final String PRODID_BASE = "-//EteSync//" + BuildConfig.APPLICATION_ID + "/" + BuildConfig.VERSION_NAME;
 
     public static final int DEFAULT_SYNC_INTERVAL = 4 * 3600;  // 4 hours
     public static final long DEFAULT_RETRY_DELAY = 30 * 60; // 30 minutes