diff --git a/config-drive/master_config.yaml b/config-drive/master_config.yaml
index 6c747fe..7d975fd 100644
--- a/config-drive/master_config.yaml
+++ b/config-drive/master_config.yaml
@@ -24,6 +24,8 @@
 
       export MCP_SALT_REPO_URL=${MCP_SALT_REPO_URL:-"http://mirror.mirantis.com/"}
       export MCP_SALT_REPO=${MCP_SALT_REPO:-"deb [arch=amd64] $MCP_SALT_REPO_URL/$MCP_VERSION/salt-formulas/xenial xenial main"}
+
+      export ENABLE_MCP_SALT_REPO_UPDATES=${ENABLE_MCP_SALT_REPO_UPDATES:-"true"}
       export MCP_SALT_REPO_UPDATES=${MCP_SALT_REPO_UPDATES:-"deb [arch=amd64] $MCP_SALT_REPO_URL/update/$MCP_VERSION/salt-formulas/xenial xenial main"}
       export MCP_SALT_REPO_KEY=${MCP_SALT_REPO_KEY:-"${MCP_SALT_REPO_URL}/${MCP_VERSION}/salt-formulas/xenial/archive-salt-formulas.key"}
 
@@ -53,7 +55,9 @@
 
       curl -s ${MCP_SALT_REPO_KEY} | apt-key add -
       echo "${MCP_SALT_REPO}" > /etc/apt/sources.list.d/mcp_salt.list
-      echo "${MCP_SALT_REPO_UPDATES}" >> /etc/apt/sources.list.d/mcp_salt.list
+      if [[ "${ENABLE_MCP_SALT_REPO_UPDATES}" == "true" ]] ; then
+        echo "${MCP_SALT_REPO_UPDATES}" >> /etc/apt/sources.list.d/mcp_salt.list
+      fi
       apt-get update
       apt-get install -y salt-formula-*