diff --git a/nvm-exec b/nvm-exec
index 55ea0c1..c47cd06 100755
--- a/nvm-exec
+++ b/nvm-exec
@@ -2,10 +2,11 @@
 
 DIR="$(command cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 
+# shellcheck disable=SC1090
 \. "$DIR/nvm.sh" --no-use
 
 if [ -n "$NODE_VERSION" ]; then
-  nvm use $NODE_VERSION > /dev/null || exit 127
+  nvm use "$NODE_VERSION" > /dev/null || exit 127
 elif ! nvm use >/dev/null 2>&1; then
   echo "No NODE_VERSION provided; no .nvmrc file found" >&2
   exit 127