diff --git a/.github/actions/rust/action.yml b/.github/actions/rust/action.yml
index df10b5848..473c326c1 100644
--- a/.github/actions/rust/action.yml
+++ b/.github/actions/rust/action.yml
@@ -32,7 +32,7 @@ runs:
 
     - name: Install Rust tools
       shell: bash
-      run: cargo +${{ inputs.version }} binstall --no-confirm cargo-llvm-cov cargo-nextest flamegraph
+      run: cargo +${{ inputs.version }} binstall --no-confirm cargo-llvm-cov cargo-nextest flamegraph cargo-hack
 
     - name: Use Rust cache
       uses: Swatinem/rust-cache@v2
diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index 8ce5383db..c92114a98 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -142,7 +142,12 @@ jobs:
         if: success() || failure()
 
       - name: Clippy
-        run: cargo +${{ matrix.rust-toolchain }} clippy --all-targets -- -D warnings || ${{ matrix.rust-toolchain == 'nightly' }}
+        run: |
+          # Use cargo-hack to run clippy on each crate individually with its
+          # respective default features only. Can reveal warnings otherwise
+          # hidden given that a plain cargo clippy combines all features of the
+          # workspace. See e.g. https://github.com/mozilla/neqo/pull/1695.
+          cargo +${{ matrix.rust-toolchain }} hack clippy --all-targets -- -D warnings || ${{ matrix.rust-toolchain == 'nightly' }}
         if: success() || failure()
 
       - name: Check rustdoc links
diff --git a/neqo-common/src/datagram.rs b/neqo-common/src/datagram.rs
index d6ed43bde..04ba1a45a 100644
--- a/neqo-common/src/datagram.rs
+++ b/neqo-common/src/datagram.rs
@@ -54,6 +54,7 @@ impl Datagram {
         self.ttl
     }
 
+    #[cfg(feature = "udp")]
     #[must_use]
     pub(crate) fn into_data(self) -> Vec<u8> {
         self.d