diff --git a/psopacket/src/lib.rs b/psopacket/src/lib.rs
index 91d4b97..cc621c4 100644
--- a/psopacket/src/lib.rs
+++ b/psopacket/src/lib.rs
@@ -222,7 +222,7 @@ pub fn pso_packet(attr: TokenStream, item: TokenStream) -> TokenStream {
 
     let psopacket = quote! {
         impl PSOPacket for #this_struct {
-            fn from_bytes(data: &Vec<u8>) -> Result<#this_struct, PacketParseError> {
+            fn from_bytes(data: &[u8]) -> Result<#this_struct, PacketParseError> {
                 let mut cur = std::io::Cursor::new(data);
                 let mut b: [u8; 2] = [0; 2];
                 cur.read(&mut b).unwrap();
diff --git a/src/lib.rs b/src/lib.rs
index 9920921..272503c 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -14,7 +14,7 @@ pub enum PacketParseError {
 
 
 pub trait PSOPacket: std::fmt::Debug {
-    fn from_bytes(data: &Vec<u8>) -> Result<Self, PacketParseError> where Self: Sized;
+    fn from_bytes(data: &[u8]) -> Result<Self, PacketParseError> where Self: Sized;
     fn as_bytes(&self) -> Vec<u8>;
 }
 
diff --git a/src/packet/patch.rs b/src/packet/patch.rs
index b3f8102..71165f4 100644
--- a/src/packet/patch.rs
+++ b/src/packet/patch.rs
@@ -76,7 +76,7 @@ pub struct FileSend {
 }
 
 impl PSOPacket for FileSend {
-    fn from_bytes(_data: &Vec<u8>) -> Result<FileSend, PacketParseError> {
+    fn from_bytes(_data: &[u8]) -> Result<FileSend, PacketParseError> {
         // TODO: implement this? it shouldn't be called on the server side ever...
         unimplemented!();
     }