diff --git a/ext/central-controller-docker/main.sh b/ext/central-controller-docker/main.sh
index 2938ba11c..2f2cd8985 100755
--- a/ext/central-controller-docker/main.sh
+++ b/ext/central-controller-docker/main.sh
@@ -79,10 +79,17 @@ echo "{
 }    
 " > /var/lib/zerotier-one/local.conf
 
-until /usr/pgsql-10/bin/pg_isready -h ${ZT_DB_HOST} -p ${ZT_DB_PORT}; do
-	echo "Waiting for PostgreSQL...";
-	sleep 2;
-done
+if [ -n "$DB_SERVER_CA" ]; then
+    until /usr/pgsql-10/bin/pg_isready -h ${ZT_DB_HOST} -p ${ZT_DB_PORT} -d "sslmode=prefer sslcert=${DB_CLIENT_CERT} sslkey=${DB_CLIENT_KEY} sslrootcert=${DB_SERVER_CA}"; do
+	    echo "Waiting for PostgreSQL...";
+	    sleep 2;
+    done
+else
+    until /usr/pgsql-10/bin/pg_isready -h ${ZT_DB_HOST} -p ${ZT_DB_PORT}; do
+	    echo "Waiting for PostgreSQL...";
+	    sleep 2;
+    done
+fi
 
 export GLIBCXX_FORCE_NEW=1
 export GLIBCPP_FORCE_NEW=1