diff --git a/8/mysql-tomcat/Dockerfile b/8/mysql-tomcat/Dockerfile
index 9693fd35ebaa288c74fe697abd0f2530297ce441..000dcf5a8c460c6a156dcb1238d335be71363204 100644
--- a/8/mysql-tomcat/Dockerfile
+++ b/8/mysql-tomcat/Dockerfile
@@ -31,11 +31,13 @@ MAINTAINER Vincent Massol <vincent@massol.net>
 # Note: when using docker-compose, the ENV values below are overridden from the .env file.
 
 # Install LibreOffice + other tools
+# Note that procps is required to get ps which is used by JODConverter to start LibreOffice
 RUN apt-get update && \
   apt-get --no-install-recommends -y install \
     curl \
     libreoffice \
     unzip \
+    procps \
     libmysql-java && \
   rm -rf /var/lib/apt/lists/*
 
diff --git a/8/postgres-tomcat/Dockerfile b/8/postgres-tomcat/Dockerfile
index 6c5a454dda27ec231345114931e38a0cc17fcf38..a119d01a18411beba023bd945f764010677acb09 100644
--- a/8/postgres-tomcat/Dockerfile
+++ b/8/postgres-tomcat/Dockerfile
@@ -31,11 +31,13 @@ MAINTAINER Vincent Massol <vincent@massol.net>
 # Note: when using docker-compose, the ENV values below are overridden from the .env file.
 
 # Install LibreOffice + other tools
+# Note that procps is required to get ps which is used by JODConverter to start LibreOffice
 RUN apt-get update && \
   apt-get --no-install-recommends -y install \
     curl \
     libreoffice \
     unzip \
+    procps \
     libpostgresql-jdbc-java && \
   rm -rf /var/lib/apt/lists/*
 
diff --git a/9/mysql-tomcat/Dockerfile b/9/mysql-tomcat/Dockerfile
index 33ee80c29dce2ba73624fb8bd1c21842ae5fd88b..20833e258b28635007d2157662a189155c7a9433 100644
--- a/9/mysql-tomcat/Dockerfile
+++ b/9/mysql-tomcat/Dockerfile
@@ -31,11 +31,13 @@ MAINTAINER Vincent Massol <vincent@massol.net>
 # Note: when using docker-compose, the ENV values below are overridden from the .env file.
 
 # Install LibreOffice + other tools
+# Note that procps is required to get ps which is used by JODConverter to start LibreOffice
 RUN apt-get update && \
   apt-get --no-install-recommends -y install \
     curl \
     libreoffice \
     unzip \
+    procps \
     libmysql-java && \
   rm -rf /var/lib/apt/lists/*
 
diff --git a/9/postgres-tomcat/Dockerfile b/9/postgres-tomcat/Dockerfile
index a82d9fdb812eb11ca2c7fd4ae8ff6adcd8b5491a..786bf7be218c75cf22de6a02a602345a7ea548b2 100644
--- a/9/postgres-tomcat/Dockerfile
+++ b/9/postgres-tomcat/Dockerfile
@@ -31,11 +31,13 @@ MAINTAINER Vincent Massol <vincent@massol.net>
 # Note: when using docker-compose, the ENV values below are overridden from the .env file.
 
 # Install LibreOffice + other tools
+# Note that procps is required to get ps which is used by JODConverter to start LibreOffice
 RUN apt-get update && \
   apt-get --no-install-recommends -y install \
     curl \
     libreoffice \
     unzip \
+    procps \
     libpostgresql-jdbc-java && \
   rm -rf /var/lib/apt/lists/*
 
diff --git a/template/Dockerfile b/template/Dockerfile
index 74c4c07146125bfc278c0ac654822540f63723e8..a3dc5e74e0208e62a0edb343a57f8f75569b4fbb 100644
--- a/template/Dockerfile
+++ b/template/Dockerfile
@@ -31,11 +31,13 @@ MAINTAINER Vincent Massol <vincent@massol.net>
 # Note: when using docker-compose, the ENV values below are overridden from the .env file.
 
 # Install LibreOffice + other tools
+# Note that procps is required to get ps which is used by JODConverter to start LibreOffice
 RUN apt-get update && \\
   apt-get --no-install-recommends -y install \\
     curl \\
     libreoffice \\
     unzip \\
+    procps \\
     <% if (db == 'mysql') print 'libmysql-java'
        if (db == 'postgres') print 'libpostgresql-jdbc-java' %> && \\
   rm -rf /var/lib/apt/lists/*