diff --git a/src/KafkaNET.Library/Cfg/SyncProducerConfiguration.cs b/src/KafkaNET.Library/Cfg/SyncProducerConfiguration.cs
index 8c02c91..f186f80 100644
--- a/src/KafkaNET.Library/Cfg/SyncProducerConfiguration.cs
+++ b/src/KafkaNET.Library/Cfg/SyncProducerConfiguration.cs
@@ -35,7 +35,7 @@ public class SyncProducerConfiguration : ISyncProducerConfigShared
 
         public const int DefaultCorrelationId = -1;
 
-        public const string DefaultClientId = "";
+        public const string DefaultClientId = " "; //NOTE: Space is required for 0.9 producer https://issues.apache.org/jira/browse/KAFKA-3088
 
         public const short DefaultRequiredAcks = 0;