diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
index 3d84e9b..908458e 100644
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -17,7 +17,7 @@ jobs:
       uses: actions-rs/toolchain@v1
       with:
           profile: minimal
-          toolchain: nightly-2021-05-09
+          toolchain: nightly
           override: true
           components: llvm-tools-preview
     
diff --git a/src/coarse_channel/mod.rs b/src/coarse_channel/mod.rs
index 90dd7a6..193b75f 100644
--- a/src/coarse_channel/mod.rs
+++ b/src/coarse_channel/mod.rs
@@ -383,9 +383,8 @@ impl CoarseChannel {
         coarse_channels
             .iter()
             .flat_map(|coarse_chan| {
-                let chan_start_hz = coarse_chan.chan_start_hz;
                 (0..num_fine_chans_per_coarse).map(move |fine_chan_idx| {
-                    chan_start_hz as f64
+                    coarse_chan.chan_start_hz as f64
                         + ((fine_chan_idx as f64 + odd_even_adjustment) * fine_chan_width_hz as f64)
                         + offset_hz
                 })