diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 4917c01..4010364 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -39,15 +39,17 @@ jobs:
         rustup default stable
       shell: bash
     - name: Build without default features
-      run: cargo check --no-default-features
+      run: cargo check --workspace --no-default-features
     - name: Build the `wat` feature
-      run: cargo check --no-default-features --features wat
+      run: cargo check --workspace --no-default-features --features wat
     - name: Build the `wit` feature
-      run: cargo check --no-default-features --features wit
+      run: cargo check --workspace --no-default-features --features wit
     - name: Build the `registry` feature
-      run: cargo check --no-default-features --features registry
+      run: cargo check --workspace --no-default-features --features registry
+    - name: Build the `serde` feature
+      run: cargo check --workspace --no-default-features --features serde
     - name: Build all features
-      run: cargo check --all-features
+      run: cargo check --workspace --all-features
 
   rustfmt:
     name: Format source code
diff --git a/crates/wac-types/src/component.rs b/crates/wac-types/src/component.rs
index 6436e10..f62038b 100644
--- a/crates/wac-types/src/component.rs
+++ b/crates/wac-types/src/component.rs
@@ -100,7 +100,7 @@ impl fmt::Display for WorldId {
 pub struct ModuleTypeId(Id<ModuleType>);
 
 #[cfg(feature = "serde")]
-impl serde::Serialize for ModuleId {
+impl serde::Serialize for ModuleTypeId {
     fn serialize<S: serde::Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
         self.0.index().serialize(serializer)
     }