diff --git a/.travis.yml b/.travis.yml
index 8a35d5e..3d7e428 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -17,6 +17,7 @@ install:
     - pip install setuptools pip --upgrade
     - pip install -e file://$PWD#egg=ipython[test] --upgrade
     - pip install codecov --upgrade
+    - sudo apt-get install graphviz
 script:
     - cd /tmp && iptest --coverage xml && cd -
     # On the latest Python only, make sure that the docs build.
diff --git a/docs/make.cmd b/docs/make.cmd
index 3f95b10..aa997be 100644
--- a/docs/make.cmd
+++ b/docs/make.cmd
@@ -10,7 +10,7 @@ SET SRCDIR=source
 SET PYTHON=python
 
 IF "%PAPER%" == "" SET PAPER=a4
-SET ALLSPHINXOPTS=-d build\doctrees -D latex_paper_size=%PAPER% %SPHINXOPTS% %SRCDIR%
+SET ALLSPHINXOPTS=-d build\doctrees -D latex_paper_size=%PAPER% -D graphviz_dot="C:\Program Files (x86)\Graphviz2.38\bin\dot.exe" %SPHINXOPTS% %SRCDIR%
 
 FOR %%X IN (%SPHINXBUILD%.exe) DO SET P=%%~$PATH:X
 
@@ -80,4 +80,4 @@ ECHO.
 ECHO Error: Build process failed!
 
 :END
-ENDLOCAL
\ No newline at end of file
+ENDLOCAL