diff --git a/Tools/travis-linux-install.sh b/Tools/travis-linux-install.sh
index bd18dfb3c..43bdb77bc 100755
--- a/Tools/travis-linux-install.sh
+++ b/Tools/travis-linux-install.sh
@@ -63,17 +63,17 @@ case "$SWIGLANG" in
 		travis_retry sudo apt-get -qq install ocaml ocaml-findlib
 		;;
 	"octave")
-		# Travis adds external PPAs which contain newer versions of packages
-		# than in baseline trusty. These newer packages prevent some of the
-		# Octave packages in ppa:kwwette/octave, which rely on the older
-		# packages in trusty, from installing. To prevent these kind of
-		# interactions arising, clean out all external PPAs added by Travis
-		# before installing Octave
-		travis_retry sudo rm -rf /etc/apt/sources.list.d/*
-		travis_retry sudo apt-get -qq update
 		if [[ -z "$VER" ]]; then
 			travis_retry sudo apt-get -qq install liboctave-dev
 		else
+			# Travis adds external PPAs which contain newer versions of packages
+			# than in baseline trusty. These newer packages prevent some of the
+			# Octave packages in ppa:kwwette/octave, which rely on the older
+			# packages in trusty, from installing. To prevent these kind of
+			# interactions arising, clean out all external PPAs added by Travis
+			# before installing Octave
+			sudo rm -rf /etc/apt/sources.list.d/*
+			travis_retry sudo apt-get -qq update
 			travis_retry sudo add-apt-repository -y ppa:kwwette/octaves
 			travis_retry sudo apt-get -qq update
 			travis_retry sudo apt-get -qq install liboctave${VER}-dev