diff --git a/Cargo.lock b/Cargo.lock
index 7e6d3293..f67ee4e6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -164,7 +164,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 
 [[package]]
 name = "cernan"
-version = "0.8.4-pre"
+version = "0.8.4"
 dependencies = [
  "byteorder 1.2.1 (registry+https://github.com/rust-lang/crates.io-index)",
  "chan-signal 0.3.1 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/Cargo.toml b/Cargo.toml
index 4ff96510..14e824dd 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,7 +7,7 @@ license = "MIT"
 name = "cernan"
 readme = "README.md"
 repository = "https://github.com/postmates/cernan"
-version = "0.8.4-pre"
+version = "0.8.4"
 
 [[bin]]
 name = "cernan"
diff --git a/src/sink/prometheus.rs b/src/sink/prometheus.rs
index c3c41cc8..7217fbad 100644
--- a/src/sink/prometheus.rs
+++ b/src/sink/prometheus.rs
@@ -138,7 +138,7 @@ impl Accumulator {
                         samples.insert(idx, telem);
                         if samples.len() > cap {
                             let top_idx = samples.len() - cap;
-                            samples.drain(0 .. top_idx);
+                            samples.drain(0..top_idx);
                         }
                     }
                 }