diff --git a/Cargo.toml b/Cargo.toml
index 3eb5dd8..c242119 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -36,6 +36,6 @@ harness = false
 [dependencies]
 subtle = "2.2.1"
 crossbeam-utils = "0.7"
-metrics = "0.13.0-alpha.8"
+metrics = "=0.13.0-alpha.11"
 num_cpus = "1.13"
 rand = "0.7"
diff --git a/src/model.rs b/src/model.rs
index 1bbdc8c..940b73a 100644
--- a/src/model.rs
+++ b/src/model.rs
@@ -49,13 +49,13 @@ impl fmt::Display for ModelRecorder {
 
         counters.sort_by(|(k1, _), (k2, _)| {
             let key1 = (
-                k1.name(),
+                k1.name().to_string(),
                 k1.labels()
                     .map(|l| (l.key(), l.value()))
                     .collect::<Vec<_>>(),
             );
             let key2 = (
-                k2.name(),
+                k2.name().to_string(),
                 k2.labels()
                     .map(|l| (l.key(), l.value()))
                     .collect::<Vec<_>>(),