diff --git a/src/SplunkLogger/LoggerFactoryExtensions.cs b/src/SplunkLogger/LoggerFactoryExtensions.cs
index b34b781..0ee990a 100644
--- a/src/SplunkLogger/LoggerFactoryExtensions.cs
+++ b/src/SplunkLogger/LoggerFactoryExtensions.cs
@@ -15,7 +15,7 @@ public static class LoggerFactoryExtensions
         /// <param name="loggerFactory">Logger factory.</param>
         /// <param name="configuration">Configuration.</param>
         /// <param name="formatter">Custom text formatter.</param>
-        public static ILoggerFactory AddHECRawSplunkLogger(this ILoggerFactory loggerFactory, SplunkLoggerConfiguration configuration, ILoggerFormatter formatter)
+        public static ILoggerFactory AddHECRawSplunkLogger(this ILoggerFactory loggerFactory, SplunkLoggerConfiguration configuration, ILoggerFormatter formatter = null)
         {
             loggerFactory.AddProvider(new SplunkHECRawLoggerProvider(configuration, formatter));
             return loggerFactory;
@@ -27,7 +27,7 @@ public static ILoggerFactory AddHECRawSplunkLogger(this ILoggerFactory loggerFac
         /// <param name="loggerFactory">Logger factory.</param>
         /// <param name="configuration">Configuration.</param>
         /// <param name="formatter">Custom text formatter.</param>
-        public static ILoggerFactory AddHECJsonSplunkLogger(this ILoggerFactory loggerFactory, SplunkLoggerConfiguration configuration, ILoggerFormatter formatter)
+        public static ILoggerFactory AddHECJsonSplunkLogger(this ILoggerFactory loggerFactory, SplunkLoggerConfiguration configuration, ILoggerFormatter formatter = null)
         {
             loggerFactory.AddProvider(new SplunkHECJsonLoggerProvider(configuration, formatter));
             return loggerFactory;
@@ -39,7 +39,7 @@ public static ILoggerFactory AddHECJsonSplunkLogger(this ILoggerFactory loggerFa
         /// <param name="loggerFactory">Logger factory.</param>
         /// <param name="configuration">Configuration.</param>
         /// <param name="formatter">Custom text formatter.</param>
-        public static ILoggerFactory AddTcpSplunkLogger(this ILoggerFactory loggerFactory, SplunkLoggerConfiguration configuration, ILoggerFormatter formatter)
+        public static ILoggerFactory AddTcpSplunkLogger(this ILoggerFactory loggerFactory, SplunkLoggerConfiguration configuration, ILoggerFormatter formatter = null)
         {
             loggerFactory.AddProvider(new SplunkTcpLoggerProvider(configuration, formatter));
             return loggerFactory;
@@ -51,7 +51,7 @@ public static ILoggerFactory AddTcpSplunkLogger(this ILoggerFactory loggerFactor
         /// <param name="loggerFactory">Logger factory.</param>
         /// <param name="configuration">Configuration.</param>
         /// <param name="formatter">Custom text formatter.</param>
-        public static ILoggerFactory AddUdpSplunkLogger(this ILoggerFactory loggerFactory, SplunkLoggerConfiguration configuration, ILoggerFormatter formatter)
+        public static ILoggerFactory AddUdpSplunkLogger(this ILoggerFactory loggerFactory, SplunkLoggerConfiguration configuration, ILoggerFormatter formatter = null)
         {
             loggerFactory.AddProvider(new SplunkUdpLoggerProvider(configuration, formatter));
             return loggerFactory;