diff --git a/protocol/src/item.rs b/protocol/src/item.rs
index 9d791e9..8aa6ab4 100644
--- a/protocol/src/item.rs
+++ b/protocol/src/item.rs
@@ -39,7 +39,7 @@ impl Default for Stack {
 
 impl Serializable for Option<Stack> {
     fn read_from<R: io::Read>(buf: &mut R) -> Result<Option<Stack>, protocol::Error> {
-        let protocol_version = unsafe { protocol::CURRENT_PROTOCOL_VERSION };
+        let protocol_version = protocol::current_protocol_version();
 
         if protocol_version >= 404 {
             let present = buf.read_u8()? != 0;
diff --git a/protocol/src/types/metadata.rs b/protocol/src/types/metadata.rs
index e27e043..17c18eb 100644
--- a/protocol/src/types/metadata.rs
+++ b/protocol/src/types/metadata.rs
@@ -433,7 +433,7 @@ impl Metadata {
 
 impl Serializable for Metadata {
     fn read_from<R: io::Read>(buf: &mut R) -> Result<Self, protocol::Error> {
-        let protocol_version = unsafe { protocol::CURRENT_PROTOCOL_VERSION };
+        let protocol_version = protocol::current_protocol_version();
 
         if protocol_version >= 404 {
             Metadata::read_from113(buf)
@@ -445,7 +445,7 @@ impl Serializable for Metadata {
     }
 
     fn write_to<W: io::Write>(&self, buf: &mut W) -> Result<(), protocol::Error> {
-        let protocol_version = unsafe { protocol::CURRENT_PROTOCOL_VERSION };
+        let protocol_version = protocol::current_protocol_version();
 
         if protocol_version >= 404 {
             self.write_to113(buf)