diff --git a/.travis.yml b/.travis.yml
index d4880847c..0ff62ccdd 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -41,8 +41,15 @@ script:
 after_success:
   - coverage report
   - coveralls
+
   - pip install pep8 pyflakes
   - pep8 --statistics --count PIL/*.py
   - pep8  --statistics --count Tests/*.py
   - pyflakes PIL/*.py   | tee >(wc -l)
   - pyflakes Tests/*.py | tee >(wc -l)
+
+
+    # Coverage and quality reports on just the latest diff.
+    # (Installation is very slow on Py3, so just do it for Py2.)
+  - if [ ${TRAVIS_PYTHON_VERSION:0:1} == "2" ]; then Scripts/diffcover-install.sh; fi
+  - if [ ${TRAVIS_PYTHON_VERSION:0:1} == "2" ]; then Scripts/diffcover-run.sh; fi
diff --git a/Scripts/diffcover-install.sh b/Scripts/diffcover-install.sh
new file mode 100755
index 000000000..93e06efe3
--- /dev/null
+++ b/Scripts/diffcover-install.sh
@@ -0,0 +1,7 @@
+# Fetch the remote master branch before running diff-cover on Travis CI.
+# https://github.com/edx/diff-cover#troubleshooting
+git fetch origin master:refs/remotes/origin/master
+
+# CFLAGS=-O0 means build with no optimisation.
+# Makes build much quicker for lxml and other dependencies.
+time CFLAGS=-O0 pip install --use-wheel diff_cover
diff --git a/Scripts/diffcover-run.sh b/Scripts/diffcover-run.sh
new file mode 100755
index 000000000..02efab6ae
--- /dev/null
+++ b/Scripts/diffcover-run.sh
@@ -0,0 +1,4 @@
+coverage xml
+diff-cover coverage.xml
+diff-quality --violation=pyflakes
+diff-quality --violation=pep8