diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a9b3e44..bd66081 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -18,7 +18,9 @@ jobs:
     steps:
     - uses: actions/checkout@v4
     - name: Run tests
-      run: cargo test --verbose --all-features
+      run: cargo test --all-targets --verbose --all-features
+    - name: Run no features
+      run: cargo test --all-targets --verbose --no-default-features
 
   deny:
     runs-on: ubuntu-24.04
diff --git a/midi2/src/lib.rs b/midi2/src/lib.rs
index c3204f6..795c93c 100644
--- a/midi2/src/lib.rs
+++ b/midi2/src/lib.rs
@@ -27,16 +27,73 @@ pub mod utility;
 pub mod buffer;
 pub mod error;
 
-mod detail;
+#[cfg(any(
+    feature = "channel-voice1",
+    feature = "channel-voice2",
+    feature = "ci",
+    feature = "flex-data",
+    feature = "sysex7",
+    feature = "sysex8",
+    feature = "system-common",
+    feature = "ump-stream",
+    feature = "utility"
+))]
 mod message;
+#[cfg(any(
+    feature = "channel-voice1",
+    feature = "channel-voice2",
+    feature = "ci",
+    feature = "flex-data",
+    feature = "sysex7",
+    feature = "sysex8",
+    feature = "system-common",
+    feature = "ump-stream",
+    feature = "utility"
+))]
 mod packet;
+#[cfg(any(
+    feature = "channel-voice1",
+    feature = "channel-voice2",
+    feature = "ci",
+    feature = "flex-data",
+    feature = "sysex7",
+    feature = "sysex8",
+    feature = "system-common",
+    feature = "ump-stream",
+    feature = "utility"
+))]
 mod packets;
+
+mod detail;
 mod traits;
 
 pub use ux;
 
+#[cfg(any(
+    feature = "channel-voice1",
+    feature = "channel-voice2",
+    feature = "ci",
+    feature = "flex-data",
+    feature = "sysex7",
+    feature = "sysex8",
+    feature = "system-common",
+    feature = "ump-stream",
+    feature = "utility"
+))]
 pub use message::*;
+#[cfg(any(
+    feature = "channel-voice1",
+    feature = "channel-voice2",
+    feature = "ci",
+    feature = "flex-data",
+    feature = "sysex7",
+    feature = "sysex8",
+    feature = "system-common",
+    feature = "ump-stream",
+    feature = "utility"
+))]
 pub use packets::*;
+
 pub use traits::*;
 
 pub mod num {