diff --git a/core/src/mercury/types.rs b/core/src/mercury/types.rs
index 43b9c5cd..70fb3f86 100644
--- a/core/src/mercury/types.rs
+++ b/core/src/mercury/types.rs
@@ -51,12 +51,13 @@ impl From<MercuryError> for Error {
 
 impl std::fmt::Display for MercuryMethod {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
-        match *self {
-            MercuryMethod::Get => write!(f, "GET"),
-            MercuryMethod::Sub => write!(f, "SUB"),
-            MercuryMethod::Unsub => write!(f, "UNSUB"),
-            MercuryMethod::Send => write!(f, "SEND"),
-        }
+        let s = match *self {
+            MercuryMethod::Get => "GET",
+            MercuryMethod::Sub => "SUB",
+            MercuryMethod::Unsub => "UNSUB",
+            MercuryMethod::Send => "SEND",
+        };
+        write!(f, "{}", s)
     }
 }