diff --git a/entrypoint.sh b/entrypoint.sh
index e328bf3..ea93e63 100755
--- a/entrypoint.sh
+++ b/entrypoint.sh
@@ -10,7 +10,7 @@ TARGET_BRANCH="$6"
 
 if [ -z "$REPO_USERNAME" ]
 then
-  REPO_USERNAME=$GITHUB_USERNAME
+  REPO_USERNAME="$GITHUB_USERNAME"
 fi
 if [ -z "$TARGET_BRANCH" ]
 then
@@ -23,7 +23,7 @@ echo "Cloning destination git repository"
 # Setup git
 git config --global user.email "$USER_EMAIL"
 git config --global user.name "$GITHUB_USERNAME"
-git clone --single-branch --branch $TARGET_BRANCH "https://$API_TOKEN_GITHUB@github.com/$REPO_USERNAME/$GITHUB_REPO.git" "$CLONE_DIR"
+git clone --single-branch --branch "$TARGET_BRANCH" "https://$API_TOKEN_GITHUB@github.com/$REPO_USERNAME/$GITHUB_REPO.git" "$CLONE_DIR"
 ls -la "$CLONE_DIR"
 
 echo "Cleaning destination repository of old files"
@@ -42,4 +42,4 @@ git status
 git commit --message "Update from https://github.com/$GITHUB_REPOSITORY/commit/$GITHUB_SHA"
 
 echo "Pushing git commit"
-git push origin $TARGET_BRANCH
+git push origin "$TARGET_BRANCH"