diff --git a/src/DemaConsulting.SpdxTool/SelfValidation/ValidateNtia.cs b/src/DemaConsulting.SpdxTool/SelfValidation/ValidateNtia.cs
index 85db22f..2fdde03 100644
--- a/src/DemaConsulting.SpdxTool/SelfValidation/ValidateNtia.cs
+++ b/src/DemaConsulting.SpdxTool/SelfValidation/ValidateNtia.cs
@@ -129,6 +129,7 @@ private static bool DoValidateMissingSupplier()
         var exitCode2 = Validate.RunSpdxTool(
             "validate.tmp",
             [
+                "--silent",
                 "--log", "output.log",
                 "validate",
                 "test-ntia.spdx.json",