diff --git a/src/DataMasker.Runner/Program.cs b/src/DataMasker.Runner/Program.cs
index 231691c..2c10f90 100644
--- a/src/DataMasker.Runner/Program.cs
+++ b/src/DataMasker.Runner/Program.cs
@@ -100,7 +100,7 @@ private static void RuntimeArgumentHandle()
         config.DataSource.DryRun = cliOptions.DryRun.Value;
       }
 
-      if (string.IsNullOrEmpty(cliOptions.Locale))
+      if (!string.IsNullOrEmpty(cliOptions.Locale))
       {
         config.DataGeneration.Locale = cliOptions.Locale;
       }