diff --git a/ports/ci/travis/install_deps.sh b/ports/ci/travis/install_deps.sh
index 73e8bd2..83adba5 100644
--- a/ports/ci/travis/install_deps.sh
+++ b/ports/ci/travis/install_deps.sh
@@ -33,7 +33,7 @@ fi
 if [ "${TRAVIS_OS_NAME}" = linux ]; then
     # Download chroot image
     archImage=archlinux-bootstrap-${ARCH_ROOT_DATE}-x86_64.tar.gz
-    ${DOWNLOAD_CMD} ${ARCH_ROOT_URL}/iso/${ARCH_ROOT_DATE}/$archImage
+    ${DOWNLOAD_CMD} "${ARCH_ROOT_URL}/iso/${ARCH_ROOT_DATE}/$archImage"
     sudo tar xzf "$archImage"
 
     # Configure mirrors
@@ -129,12 +129,12 @@ elif [ "${TRAVIS_OS_NAME}" = osx ]; then
     ${DOWNLOAD_CMD} "http://download.qt.io/official_releases/qt-installer-framework/${QTIFWVER}/${qtIFW}" || true
 
     if [ -e "${qtIFW}" ]; then
-        hdiutil convert ${qtIFW} -format UDZO -o qtifw
+        hdiutil convert "${qtIFW}" -format UDZO -o qtifw
         7z x -oqtifw qtifw.dmg -bb
         7z x -oqtifw qtifw/5.hfsx -bb
-        chmod +x qtifw/QtInstallerFramework-macOS-x86_64-${QTIFWVER}/QtInstallerFramework-macOS-x86_64-${QTIFWVER}.app/Contents/MacOS/QtInstallerFramework-macOS-x86_64-${QTIFWVER}
-
-        qtifw/QtInstallerFramework-macOS-x86_64-${QTIFWVER}/QtInstallerFramework-macOS-x86_64-${QTIFWVER}.app/Contents/MacOS/QtInstallerFramework-macOS-x86_64-${QTIFWVER} \
+        installer=qtifw/QtInstallerFramework-macOS-x86_64-${QTIFWVER}/QtInstallerFramework-macOS-x86_64-${QTIFWVER}.app/Contents/MacOS/QtInstallerFramework-macOS-x86_64-${QTIFWVER}
+        chmod +x "${installer}"
+        ${installer} \
             --verbose \
             --accept-licenses \
             --accept-messages \
diff --git a/ports/ci/travis/upload.sh b/ports/ci/travis/upload.sh
index 1e9f1a5..9b0b1e1 100644
--- a/ports/ci/travis/upload.sh
+++ b/ports/ci/travis/upload.sh
@@ -56,11 +56,11 @@ if [[ ! -z "$DAILY_BUILD" || ! -z "$RELEASE_BUILD" ]]; then
 
         ./jfrog bt upload \
             --user=hipersayanx \
-            --key=$BT_KEY \
+            --key="$BT_KEY" \
             --override=true \
-            --publish=$publish \
+            --publish="$publish" \
             "$f" \
-            webcamoid/webcamoid/akvirtualcamera/$version \
+            "webcamoid/webcamoid/akvirtualcamera/$version" \
             "$folder/"
     done
 
@@ -78,7 +78,7 @@ if [[ ! -z "$DAILY_BUILD" || ! -z "$RELEASE_BUILD" ]]; then
 
         cd "${TRAVIS_BUILD_DIR}"
         ${DOWNLOAD_CMD} "https://github.com/github/hub/releases/download/v${GITHUB_HUBVER}/${hub}.tgz" || true
-        tar xzf ${hub}.tgz
+        tar xzf "${hub}.tgz"
         mkdir -p .local
         cp -rf "${hub}"/* .local/