diff --git a/tools/jenkins/grpc_jenkins_slave/Dockerfile b/tools/jenkins/grpc_jenkins_slave/Dockerfile
index 7248f974092..4f5387eeb55 100644
--- a/tools/jenkins/grpc_jenkins_slave/Dockerfile
+++ b/tools/jenkins/grpc_jenkins_slave/Dockerfile
@@ -32,7 +32,7 @@
 
 FROM debian:jessie
 
-# Install Git.
+# Install Git and basic packages.
 RUN apt-get update && apt-get install -y \
   autoconf \
   autotools-dev \
@@ -44,6 +44,7 @@ RUN apt-get update && apt-get install -y \
   gcc-multilib \
   git \
   gyp \
+  lcov \
   libc6 \
   libc6-dbg \
   libc6-dev \
diff --git a/tools/jenkins/grpc_jenkins_slave_32bits/Dockerfile b/tools/jenkins/grpc_jenkins_slave_32bits/Dockerfile
index c1ff85c3ca1..81a03990916 100644
--- a/tools/jenkins/grpc_jenkins_slave_32bits/Dockerfile
+++ b/tools/jenkins/grpc_jenkins_slave_32bits/Dockerfile
@@ -32,7 +32,7 @@
 
 FROM 32bit/debian:jessie
 
-# Install Git.
+# Install Git and basic packages.
 RUN apt-get update && apt-get install -y \
   autoconf \
   autotools-dev \
@@ -44,6 +44,7 @@ RUN apt-get update && apt-get install -y \
   gcc-multilib \
   git \
   gyp \
+  lcov \
   libc6 \
   libc6-dbg \
   libc6-dev \