diff --git a/src/protocol/parser/pass_definitions.rs b/src/protocol/parser/pass_definitions.rs
index 4214c9c89221f9ae45203396b927e1e5d205a2cd..8a4a30886030ca001e78c0ed0293b0e882adb062 100644
--- a/src/protocol/parser/pass_definitions.rs
+++ b/src/protocol/parser/pass_definitions.rs
@@ -916,6 +916,7 @@ impl PassDefinitions {
 
             match token.unwrap() {
                 TK::Equal               => Some(AO::Set),
+                TK::AtEquals            => Some(AO::Concatenated),
                 TK::StarEquals          => Some(AO::Multiplied),
                 TK::SlashEquals         => Some(AO::Divided),
                 TK::PercentEquals       => Some(AO::Remained),