diff --git a/Tools/travis-linux-install.sh b/Tools/travis-linux-install.sh
index 8cedcbc79..175044ff1 100755
--- a/Tools/travis-linux-install.sh
+++ b/Tools/travis-linux-install.sh
@@ -97,6 +97,7 @@ case "$SWIGLANG" in
 			sudo add-apt-repository -y ppa:brightbox/ruby-ng
 			sudo apt-get -qq update
 			sudo apt-get -qq install ruby2.3 ruby2.3-dev
+			sudo gem pristine --all
 			WITHLANG=$SWIGLANG=$SWIGLANG$VER
 		fi
 		;;