diff --git a/index.js b/index.js
index ec44ad7..11bdd1b 100644
--- a/index.js
+++ b/index.js
@@ -118,7 +118,7 @@ fastify.post('/addPrank', async (request, reply) => {
                     && "supplement" in content) {
                         let amount = parseInt(content.amount)
                         if (!isNaN(amount)) {
-                            if (!Supplements.includes(content.supplement)) {
+                            if (Supplements.includes(content.supplement)) {
                                 if (amount < MaxAmountCrepe) {
                                     let prankUid = makeid(16);
                                     PrankData[prankUid] = {