diff --git a/packer/registry_builder.go b/packer/registry_builder.go
index 28674f7af..23ac56e2c 100644
--- a/packer/registry_builder.go
+++ b/packer/registry_builder.go
@@ -73,7 +73,7 @@ func (b *RegistryBuilder) Run(ctx context.Context, ui packersdk.Ui, hook packers
 	decoder, err := mapstructure.NewDecoder(&mapstructure.DecoderConfig{
 		Result:           &images,
 		WeaklyTypedInput: true,
-		ErrorUnused:      true,
+		ErrorUnused:      false,
 	})
 	if err != nil {
 		return artifact, fmt.Errorf("failed to create decoder for HCP Packer registry image: %w", err)
diff --git a/packer/registry_post_processor.go b/packer/registry_post_processor.go
index 6a18e4771..2e9adacc2 100644
--- a/packer/registry_post_processor.go
+++ b/packer/registry_post_processor.go
@@ -65,7 +65,7 @@ func (p *RegistryPostProcessor) PostProcess(ctx context.Context, ui packersdk.Ui
 	decoder, err := mapstructure.NewDecoder(&mapstructure.DecoderConfig{
 		Result:           &images,
 		WeaklyTypedInput: true,
-		ErrorUnused:      true,
+		ErrorUnused:      false,
 	})
 	if err != nil {
 		return source, false, false, fmt.Errorf("failed to create decoder for HCP Packer registry image: %w", err)