diff --git a/Lib/distutils/tests/test_build_py.py b/Lib/distutils/tests/test_build_py.py
index 18283dc7220..0712e92c6ab 100644
--- a/Lib/distutils/tests/test_build_py.py
+++ b/Lib/distutils/tests/test_build_py.py
@@ -168,7 +168,8 @@ def test_dont_write_bytecode(self):
         finally:
             sys.dont_write_bytecode = old_dont_write_bytecode
 
-        self.assertIn('byte-compiling is disabled', self.logs[0][1])
+        self.assertIn('byte-compiling is disabled',
+                      self.logs[0][1] % self.logs[0][2])
 
 
 def test_suite():
diff --git a/Lib/distutils/tests/test_install_lib.py b/Lib/distutils/tests/test_install_lib.py
index 5378aa82495..fda6315bbc7 100644
--- a/Lib/distutils/tests/test_install_lib.py
+++ b/Lib/distutils/tests/test_install_lib.py
@@ -104,7 +104,8 @@ def test_dont_write_bytecode(self):
         finally:
             sys.dont_write_bytecode = old_dont_write_bytecode
 
-        self.assertIn('byte-compiling is disabled', self.logs[0][1])
+        self.assertIn('byte-compiling is disabled',
+                      self.logs[0][1] % self.logs[0][2])
 
 
 def test_suite():