diff --git a/support/testing/infra/basetest.py b/support/testing/infra/basetest.py
index 4f020e8a93..9fb9dffc53 100644
--- a/support/testing/infra/basetest.py
+++ b/support/testing/infra/basetest.py
@@ -37,7 +37,6 @@ class BRConfigTest(unittest.TestCase):
         super(BRConfigTest, self).__init__(names)
         self.testname = self.__class__.__name__
         self.builddir = self.outputdir and os.path.join(self.outputdir, self.testname)
-        self.config += '\nBR2_BACKUP_SITE=""\n'
         self.config += '\nBR2_DL_DIR="{}"\n'.format(self.downloaddir)
         self.config += "\nBR2_JLEVEL={}\n".format(self.jlevel)
 
diff --git a/support/testing/tests/download/test_git.py b/support/testing/tests/download/test_git.py
index 3cf98f6456..ba52e03ef5 100644
--- a/support/testing/tests/download/test_git.py
+++ b/support/testing/tests/download/test_git.py
@@ -7,7 +7,10 @@ import infra
 
 
 class GitTestBase(infra.basetest.BRConfigTest):
-    config = ""
+    config = \
+        """
+        BR2_BACKUP_SITE=""
+        """
     gitremotedir = infra.filepath("tests/download/git-remote")
     gitremote = None
 
diff --git a/support/testing/tests/download/test_gitforge.py b/support/testing/tests/download/test_gitforge.py
index 477c365a34..e1ac35ec67 100644
--- a/support/testing/tests/download/test_gitforge.py
+++ b/support/testing/tests/download/test_gitforge.py
@@ -5,7 +5,10 @@ import infra
 
 
 class GitforgeTestBase(infra.basetest.BRConfigTest):
-    config = ""
+    config = \
+        """
+        BR2_BACKUP_SITE=""
+        """
 
     def setUp(self):
         super(GitforgeTestBase, self).setUp()
diff --git a/support/testing/tests/download/test_ssh.py b/support/testing/tests/download/test_ssh.py
index 7d6ac3aaf7..126002a355 100644
--- a/support/testing/tests/download/test_ssh.py
+++ b/support/testing/tests/download/test_ssh.py
@@ -7,7 +7,9 @@ import infra
 
 
 class SSHTestBase(infra.basetest.BRConfigTest):
-    config = infra.basetest.MINIMAL_CONFIG
+    config = infra.basetest.MINIMAL_CONFIG + '''
+BR2_BACKUP_SITE=""
+'''
     sshd_test_dir = infra.filepath("tests/download/sshd")
     sshd = None
 
diff --git a/support/testing/tests/package/test_rust.py b/support/testing/tests/package/test_rust.py
index 8160cb6053..763125ca20 100644
--- a/support/testing/tests/package/test_rust.py
+++ b/support/testing/tests/package/test_rust.py
@@ -70,6 +70,7 @@ class TestRustVendoring(infra.basetest.BRConfigTest):
         BR2_PACKAGE_RIPGREP=y
         BR2_PACKAGE_PYTHON3=y
         BR2_PACKAGE_PYTHON_CRYPTOGRAPHY=y
+        BR2_BACKUP_SITE=""
         """
 
     def setUp(self):