diff --git a/app/lib/api_entreprise/api.rb b/app/lib/api_entreprise/api.rb
index a84dd8c36..f90abd6e9 100644
--- a/app/lib/api_entreprise/api.rb
+++ b/app/lib/api_entreprise/api.rb
@@ -34,7 +34,7 @@ class ApiEntreprise::API
 
     if response.success?
       JSON.parse(response.body, symbolize_names: true)
-    elsif response.code == 404 || response.code == 422
+    elsif response.code&.between?(401, 499)
       raise RestClient::ResourceNotFound
     else
       raise RestClient::RequestFailed
diff --git a/spec/fixtures/files/api_entreprise/entreprises_private.json b/spec/fixtures/files/api_entreprise/entreprises_private.json
new file mode 100644
index 000000000..0b77b10ee
--- /dev/null
+++ b/spec/fixtures/files/api_entreprise/entreprises_private.json
@@ -0,0 +1,6 @@
+{
+  "errors": [
+    "Le SIREN ou SIRET est non diffusable"
+  ],
+  "gateway_error": true
+}
diff --git a/spec/lib/api_entreprise/api_spec.rb b/spec/lib/api_entreprise/api_spec.rb
index f2beb720f..abd7c07c2 100644
--- a/spec/lib/api_entreprise/api_spec.rb
+++ b/spec/lib/api_entreprise/api_spec.rb
@@ -31,7 +31,17 @@ describe ApiEntreprise::API do
       end
     end
 
-    context 'when siret exist' do
+    context 'when siren infos are private' do
+      let(:siren) { '111111111' }
+      let(:status) { 403 }
+      let(:body) { File.read('spec/fixtures/files/api_entreprise/entreprises_private.json') }
+
+      it 'raises RestClient::ResourceNotFound' do
+        expect { subject }.to raise_error(RestClient::ResourceNotFound)
+      end
+    end
+
+    context 'when siren exist' do
       let(:siren) { '418166096' }
       let(:status) { 200 }
       let(:body) { File.read('spec/fixtures/files/api_entreprise/entreprises.json') }