diff --git a/src/jdk.jfr/share/classes/jdk/jfr/internal/StringPool.java b/src/jdk.jfr/share/classes/jdk/jfr/internal/StringPool.java
index 624409d..33fdb13 100644
--- a/src/jdk.jfr/share/classes/jdk/jfr/internal/StringPool.java
+++ b/src/jdk.jfr/share/classes/jdk/jfr/internal/StringPool.java
@@ -48,7 +48,7 @@
 
     private static class SimpleStringIdPool {
         /* string id index */
-        private final AtomicLong sidIdx = new AtomicLong();
+        private final AtomicLong sidIdx = new AtomicLong(1);
         /* the cache */
         private final ConcurrentHashMap<String, Long> cache;
         /* max size */