diff --git a/IPython/html/tests/test_notebookapp.py b/IPython/html/tests/test_notebookapp.py
index 408bc00..088a647 100644
--- a/IPython/html/tests/test_notebookapp.py
+++ b/IPython/html/tests/test_notebookapp.py
@@ -11,6 +11,7 @@
 # Imports
 #-----------------------------------------------------------------------------
 
+import logging
 import os
 from tempfile import NamedTemporaryFile
 
@@ -31,7 +32,7 @@ def test_help_output():
     tt.help_all_output_test('notebook')
 
 def test_server_info_file():
-    nbapp = NotebookApp(profile='nbserver_file_test')
+    nbapp = NotebookApp(profile='nbserver_file_test', log=logging.getLogger())
     def get_servers():
         return list(notebookapp.list_running_servers(profile='nbserver_file_test'))
     nbapp.initialize(argv=[])
diff --git a/IPython/nbconvert/postprocessors/tests/test_pdf.py b/IPython/nbconvert/postprocessors/tests/test_pdf.py
index cc650d6..11da2cb 100644
--- a/IPython/nbconvert/postprocessors/tests/test_pdf.py
+++ b/IPython/nbconvert/postprocessors/tests/test_pdf.py
@@ -14,6 +14,7 @@ Module with tests for the PDF post-processor
 # Imports
 #-----------------------------------------------------------------------------
 
+import logging
 import os
 
 from IPython.testing import decorators as dec
@@ -56,7 +57,7 @@ class TestPDF(TestsBase):
                 f.write(HELLO_WORLD)
 
             # Construct post-processor
-            processor = PDFPostProcessor()
+            processor = PDFPostProcessor(log=logging.getLogger())
             processor.verbose = False
             processor('a.tex')