diff --git a/travis-build.sh b/travis-build.sh
index 805a60e..3be0c0e 100644
--- a/travis-build.sh
+++ b/travis-build.sh
@@ -25,7 +25,7 @@ then
 
 	# NB: Suppress "Downloading/Downloaded" messages.
 	# See: https://stackoverflow.com/a/35653426/1207769
-	export MAVEN_OPTS=-Dorg.slf4j.simpleLogger.log.org.apache.maven.cli.transfer.Slf4jMavenTransferListener=warn
+	export MAVEN_OPTS="$MAVEN_OPTS -Dorg.slf4j.simpleLogger.log.org.apache.maven.cli.transfer.Slf4jMavenTransferListener=warn" 
 
 	# Populate the settings.xml configuration.
 	mkdir -p "$HOME/.m2"