diff --git a/k9mail-library/build.gradle b/k9mail-library/build.gradle
index f95a158f6..317862f87 100644
--- a/k9mail-library/build.gradle
+++ b/k9mail-library/build.gradle
@@ -1,6 +1,7 @@
 apply plugin: 'com.android.library'
 apply from: '../gradle/plugins/checkstyle-android.gradle'
 apply from: '../gradle/plugins/findbugs-android.gradle'
+apply plugin: 'jacoco'
 
 repositories {
     jcenter()
@@ -36,6 +37,12 @@ android {
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
     }
 
+    buildTypes {
+        debug {
+            testCoverageEnabled rootProject.testCoverage
+        }
+    }
+
     lintOptions {
         abortOnError true
         warningsAsErrors true
diff --git a/k9mail/build.gradle b/k9mail/build.gradle
index c667e60a4..e14789301 100644
--- a/k9mail/build.gradle
+++ b/k9mail/build.gradle
@@ -2,6 +2,7 @@ apply plugin: 'android-sdk-manager'
 apply plugin: 'com.android.application'
 apply from: '../gradle/plugins/checkstyle-android.gradle'
 apply from: '../gradle/plugins/findbugs-android.gradle'
+apply plugin: 'jacoco'
 
 repositories {
     jcenter()