diff --git a/mccs-it/thermal/app.js b/mccs-it/thermal/app.js
index f481840..a1ea9c2 100644
--- a/mccs-it/thermal/app.js
+++ b/mccs-it/thermal/app.js
@@ -21,9 +21,9 @@ app.post('/print-credentials', async (req, res) => {
 		const infoString = Thermal.generateInfo.credentials(username, studentId);
 
 		// Generate the PDF, saved to disk
-		Thermal.generatePdf(infoString).then(res => {
+		Thermal.generatePdf(infoString).then(resolve => {
 			// Print the document
-			Thermal.print().then(res => {
+			Thermal.print().then(resolve => {
 				res.send('PDF sent to printer successfully.');
 			}).catch(e => {
 				console.error('Failed to start printing process:', e);