diff --git a/lib/plugins.js b/lib/plugins.js
index c2ccc0bc..fcdef9aa 100644
--- a/lib/plugins.js
+++ b/lib/plugins.js
@@ -198,12 +198,12 @@ function buildCartridges(rec) {
   return {
     cartridges: [
       {
-        denomination: cartridges[0],
-        count: rec.counts[0]
+        denomination: parseInt(cartridges[0], 10),
+        count: parseInt(rec.counts[0], 10)
       },
       {
-        denomination: cartridges[1],
-        count: rec.counts[1]
+        denomination: parseInt(cartridges[1], 10),
+        count: parseInt(rec.counts[1], 10)
       }
     ],
     virtualCartridges: virtualCartridges,