diff --git a/src/html5-qrcode-scanner.ts b/src/html5-qrcode-scanner.ts
index 72fb231..4bd0605 100644
--- a/src/html5-qrcode-scanner.ts
+++ b/src/html5-qrcode-scanner.ts
@@ -387,6 +387,10 @@ export class Html5QrcodeScanner {
                     = Html5QrcodeConstants.DEFAULT_REMEMBER_LAST_CAMERA_USED;
             }
 
+            if (!config.supportedScanTypes) {
+                config.supportedScanTypes = Html5QrcodeConstants.DEFAULT_SUPPORTED_SCAN_TYPE;
+            }
+
             return config;
         }