diff --git a/.travis/affects.sh b/.travis/affects.sh
index ca87b5bc4df44e..246c56fe0e8c52 100755
--- a/.travis/affects.sh
+++ b/.travis/affects.sh
@@ -5,10 +5,10 @@
 
 (
   set -x
-  git diff --name-only $TRAVIS_COMMIT_RANGE
+  git diff --name-only "$TRAVIS_COMMIT_RANGE"
 )
 
-for file in $(git diff --name-only $TRAVIS_COMMIT_RANGE); do
+for file in $(git diff --name-only "$TRAVIS_COMMIT_RANGE"); do
   if [[ $file =~ ^"$1" ]]; then
     exit 0
   fi
diff --git a/.travis/export-github-repo.sh b/.travis/export-github-repo.sh
index 48a70ab0baafe4..4a74aaec6d2116 100755
--- a/.travis/export-github-repo.sh
+++ b/.travis/export-github-repo.sh
@@ -16,11 +16,11 @@ pip3 install git-filter-repo
 declare subdir=$1
 declare repo_name=$2
 
-[[ -n $subdir ]] || {
+[[ -n "$subdir" ]] || {
   echo "Error: subdir not specified"
   exit 1
 }
-[[ -n $repo_name ]] || {
+[[ -n "$repo_name" ]] || {
   echo "Error: repo_name not specified"
   exit 1
 }
@@ -30,9 +30,9 @@ echo "Exporting $subdir"
 
 set -x
 rm -rf .github_export/"$repo_name"
-git clone https://${GITHUB_TOKEN}@github.com/solana-labs/"$repo_name" .github_export/"$repo_name"
+git clone https://"$GITHUB_TOKEN"@github.com/solana-labs/"$repo_name" .github_export/"$repo_name"
 
 # TODO: Try using `--refs $TRAVIS_COMMIT_RANGE` to speed up the filtering
 git filter-repo --subdirectory-filter "$subdir" --target .github_export/"$repo_name"
 
-git -C .github_export/"$repo_name" push https://${GITHUB_TOKEN}@github.com/solana-labs/"$repo_name"
+git -C .github_export/"$repo_name" push https://"$GITHUB_TOKEN"@github.com/solana-labs/"$repo_name"