diff --git a/.travis.yml b/.travis.yml
index 7d2823ca..a3581861 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -5,6 +5,8 @@ dist: xenial
 cache:
   pip: true
   cargo: true
+  directories:
+    - "$HOME/kcov"
 
 matrix:
   include:
@@ -56,7 +58,16 @@ install:
 script:
   - ./ci/travis/test.sh
 
+after_success:
+  - ./ci/travis/cover.sh
+
 deploy:
+  - provider: script
+    skip_cleanup: true
+    script: ./ci/travis/cover.sh
+    on:
+      branch: master
+      condition: $TRAVIS_EVENT_TYPE != "cron"
   - provider: script
     skip_cleanup: true
     script: ./ci/travis/guide.sh
diff --git a/README.md b/README.md
index c6f439c3..bb7645d6 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,7 @@
 
 [![Build Status](https://travis-ci.org/PyO3/pyo3.svg?branch=master)](https://travis-ci.org/PyO3/pyo3)
 [![Build Status](https://ci.appveyor.com/api/projects/status/github/PyO3/pyo3?branch=master&svg=true)](https://ci.appveyor.com/project/fafhrd91/pyo3)
+[![codecov](https://codecov.io/gh/PyO3/pyo3/branch/master/graph/badge.svg)](https://codecov.io/gh/PyO3/pyo3)
 [![crates.io](http://meritbadge.herokuapp.com/pyo3)](https://crates.io/crates/pyo3)
 [![Join the dev chat](https://img.shields.io/gitter/room/nwjs/nw.js.svg)](https://gitter.im/PyO3/Lobby)
 
diff --git a/ci/travis/cover.sh b/ci/travis/cover.sh
new file mode 100755
index 00000000..e9981093
--- /dev/null
+++ b/ci/travis/cover.sh
@@ -0,0 +1,26 @@
+#!/bin/sh
+
+set -ex
+
+### Run kcov in parallel #######################################################
+
+rm -f target/debug/pyo3*.d
+rm -f target/debug/test_*.d
+rm -f target/debug/test_doc-*
+
+FILES=$(find . -path ./target/debug/pyo3\* -or -path ./target/debug/test_\*)
+echo $FILES | xargs -n1 -P $(nproc) sh -c '
+  dir="target/cov/$(basename $@)"
+  mkdir -p $dir
+  echo "Collecting coverage data of $(basename $@)"
+  kcov \
+    --exclude-path=./tests \
+    --exclude-region="#[cfg(test)]:#[cfg(testkcovstopmarker)]" \
+    --exclude-pattern=/.cargo,/usr/lib \
+    --verify $dir "$@" 2>&1 >/dev/null
+' _
+
+### Upload coverage ############################################################
+
+echo "Uploading code coverage"
+curl -SsL https://codecov.io/bash | bash
diff --git a/ci/travis/setup.sh b/ci/travis/setup.sh
index 9ae10672..b7e58f42 100755
--- a/ci/travis/setup.sh
+++ b/ci/travis/setup.sh
@@ -18,3 +18,18 @@ PYTHON_LIB=$(python -c "import sysconfig; print(sysconfig.get_config_var('LIBDIR
 export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:$PYTHON_LIB:$HOME/rust/lib"
 
 echo ${LD_LIBRARY_PATH}
+
+### Setup kcov #################################################################
+
+if [ ! -f "$HOME/.cargo/bin/kcov" ]; then
+    if [ ! -d "$HOME/kcov/.git" ]; then
+        git clone --depth=1 https://github.com/SimonKagstrom/kcov "$HOME/kcov"
+    fi
+
+    cd $HOME/kcov
+    git pull
+    cmake .
+    make
+    install src/kcov $HOME/.cargo/bin/kcov
+    cd $TRAVIS_BUILD_DIR
+fi
diff --git a/ci/travis/test.sh b/ci/travis/test.sh
index 51011e8c..73e4b00e 100755
--- a/ci/travis/test.sh
+++ b/ci/travis/test.sh
@@ -3,6 +3,7 @@ set -ex
 
 cargo clean
 cargo test --features "$FEATURES num-complex"
+( cd pyo3-derive-backend; cargo test )
 if [ $TRAVIS_JOB_NAME = 'Minimum nightly' ]; then
     cargo fmt --all -- --check
     cargo clippy --features "$FEATURES num-complex"