diff --git a/backend/src/main/java/com/crypto/Caesar.java b/backend/src/main/java/com/crypto/Caesar.java
index 4bb62b9..ff13b29 100644
--- a/backend/src/main/java/com/crypto/Caesar.java
+++ b/backend/src/main/java/com/crypto/Caesar.java
@@ -7,7 +7,7 @@ public class Caesar {
 
         for(int i = 0; i < plaintext.length(); i++){
             if (encoded[i] == ' ') continue;
-            encoded[i] = alphabet.charAt(alphabet.indexOf(encoded[i]) + key % 26);
+            encoded[i] = alphabet.charAt((alphabet.indexOf(encoded[i]) + key) % 26);
         }
         return String.valueOf(encoded);
     }