diff --git a/gerrit-gwtui/src/main/java/net/codemirror/mode/ModeInfo.java b/gerrit-gwtui/src/main/java/net/codemirror/mode/ModeInfo.java
index d6b194bc6f..782500daf7 100644
--- a/gerrit-gwtui/src/main/java/net/codemirror/mode/ModeInfo.java
+++ b/gerrit-gwtui/src/main/java/net/codemirror/mode/ModeInfo.java
@@ -62,6 +62,7 @@ public class ModeInfo extends JavaScriptObject {
       Modes.I.php(),
       Modes.I.pig(),
       Modes.I.properties(),
+      Modes.I.puppet(),
       Modes.I.python(),
       Modes.I.r(),
       Modes.I.rst(),
diff --git a/gerrit-gwtui/src/main/java/net/codemirror/mode/Modes.java b/gerrit-gwtui/src/main/java/net/codemirror/mode/Modes.java
index e511be5a2d..8170c2b4f3 100644
--- a/gerrit-gwtui/src/main/java/net/codemirror/mode/Modes.java
+++ b/gerrit-gwtui/src/main/java/net/codemirror/mode/Modes.java
@@ -47,6 +47,7 @@ public interface Modes extends ClientBundle {
   @Source("php.js") @DoNotEmbed DataResource php();
   @Source("pig.js") @DoNotEmbed DataResource pig();
   @Source("properties.js") @DoNotEmbed DataResource properties();
+  @Source("puppet.js") @DoNotEmbed DataResource puppet();
   @Source("python.js") @DoNotEmbed DataResource python();
   @Source("r.js") @DoNotEmbed DataResource r();
   @Source("rst.js") @DoNotEmbed DataResource rst();
diff --git a/gerrit-server/src/main/resources/com/google/gerrit/server/mime/mime-types.properties b/gerrit-server/src/main/resources/com/google/gerrit/server/mime/mime-types.properties
index 3d8d271240..2646fd0c57 100644
--- a/gerrit-server/src/main/resources/com/google/gerrit/server/mime/mime-types.properties
+++ b/gerrit-server/src/main/resources/com/google/gerrit/server/mime/mime-types.properties
@@ -33,6 +33,7 @@ php = text/x-php
 pig = text/x-pig
 pl = text/x-perl
 pm = text/x-perl
+pp = text/x-puppet
 project.config = text/x-ini
 properties = text/x-ini
 py = text/x-python
diff --git a/lib/codemirror/cm.defs b/lib/codemirror/cm.defs
index db87b25eba..8259252289 100644
--- a/lib/codemirror/cm.defs
+++ b/lib/codemirror/cm.defs
@@ -64,6 +64,7 @@ CM_MODES = [
   'php',
   'pig',
   'properties',
+  'puppet',
   'python',
   'r',
   'rst',