diff --git a/.drone.jsonnet b/.drone.jsonnet
index c0ad7c5384..d7eb112144 100644
--- a/.drone.jsonnet
+++ b/.drone.jsonnet
@@ -38,6 +38,7 @@ local ci_dep_mirror(want_mirror) = (if want_mirror then ' -DLOCAL_MIRROR=https:/
         pull: 'always',
         environment: { ANDROID_HOME: '/usr/lib/android-sdk' },
         commands: [
+          'apt-get ninja-build',
           './gradlew testPlayDebugUnitTestCoverageReport'
         ],
       }
@@ -77,6 +78,7 @@ local ci_dep_mirror(want_mirror) = (if want_mirror then ' -DLOCAL_MIRROR=https:/
         pull: 'always',
         environment: { ANDROID_HOME: '/usr/lib/android-sdk' },
         commands: [
+          'apt-get ninja-build',
           './gradlew assemblePlayDebug'
         ],
       },