diff --git a/twine-upload.sh b/twine-upload.sh
index 8cd15c0..e34928e 100755
--- a/twine-upload.sh
+++ b/twine-upload.sh
@@ -1,7 +1,7 @@
 #! /usr/bin/env bash
 set -Eeuo pipefail
 
-TWINE_USERNAME=$INPUT_USER \
-  TWINE_PASSWORD=$INPUT_PASSWORD \
-  TWINE_REPOSITORY_URL=$INPUT_REPOSITORY_URL \
+TWINE_USERNAME="$INPUT_USER" \
+TWINE_PASSWORD="$INPUT_PASSWORD" \
+TWINE_REPOSITORY_URL="$INPUT_REPOSITORY_URL" \
   exec twine upload dist/*