diff --git a/src/Nest.Connection.Thrift/ThriftConnection.cs b/src/Nest.Connection.Thrift/ThriftConnection.cs
index 30881468797..1d2e0238a24 100644
--- a/src/Nest.Connection.Thrift/ThriftConnection.cs
+++ b/src/Nest.Connection.Thrift/ThriftConnection.cs
@@ -24,7 +24,7 @@ public ThriftConnection(IConnectionSettings connectionSettings)
 		{
 			this._connectionSettings = connectionSettings;
 			this._timeout = connectionSettings.Timeout;
-			this._poolSize = connectionSettings.MaximumAsyncConnections;
+      this._poolSize = Math.Max(1, connectionSettings.MaximumAsyncConnections);
 
 			this._resourceLock = new Semaphore(_poolSize, _poolSize);