diff --git a/src/AES.cpp b/src/AES.cpp
index 346a02d..3de9388 100644
--- a/src/AES.cpp
+++ b/src/AES.cpp
@@ -339,7 +339,7 @@ void AES::MixColumns(unsigned char** state)
       state[j][i] = temp[j]; //when the column is mixed, place it back into the state
     }
   }
-  delete temp;
+  delete[] temp;
 }
 
 void AES::AddRoundKey(unsigned char **state, unsigned char *key)