diff --git a/dev-support/docker/Dockerfile b/dev-support/docker/Dockerfile
index f761f8b4404..ad253a72669 100644
--- a/dev-support/docker/Dockerfile
+++ b/dev-support/docker/Dockerfile
@@ -24,9 +24,10 @@ FROM ubuntu:trusty
 
 WORKDIR /root
 
-RUN apt-get install -y software-properties-common
-RUN add-apt-repository -y ppa:webupd8team/java
-RUN apt-get update
+RUN apt-get update && \
+    apt-get install -y software-properties-common && \
+    add-apt-repository -y ppa:webupd8team/java && \
+    apt-get update
 
 # Auto-accept the Oracle JDK license
 RUN echo oracle-java7-installer shared/accepted-oracle-license-v1-1 select true | sudo /usr/bin/debconf-set-selections
diff --git a/hadoop-common-project/hadoop-common/CHANGES.txt b/hadoop-common-project/hadoop-common/CHANGES.txt
index 7ac0878122a..176b50ebd50 100644
--- a/hadoop-common-project/hadoop-common/CHANGES.txt
+++ b/hadoop-common-project/hadoop-common/CHANGES.txt
@@ -671,6 +671,9 @@ Release 2.8.0 - UNRELEASED
     HADOOP-12483. Maintain wrapped SASL ordering for postponed IPC responses.
     (Daryn Sharp via yliu)
 
+    HADOOP-12513. Dockerfile lacks initial 'apt-get update'.
+    (Akihiro Suda via ozawa)
+
   OPTIMIZATIONS
 
     HADOOP-12051. ProtobufRpcEngine.invoke() should use Exception.toString()