diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 6ff1e27d89..786a39e462 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -72,6 +72,7 @@ jobs:
       run: |
         cargo clippy -p windows-bindgen &&
         cargo clippy -p windows-implement &&
+        cargo clippy -p windows-interface &&
         cargo clippy -p windows-metadata &&
         cargo clippy -p windows-sys &&
         cargo clippy -p windows-tokens &&
@@ -125,6 +126,7 @@ jobs:
         cargo clippy -p test_implement_properties &&
         cargo clippy -p test_implement_vector &&
         cargo clippy -p test_implement_winrt &&
+        cargo clippy -p test_interface &&
         cargo clippy -p test_interop &&
         cargo clippy -p test_lib &&
         cargo clippy -p test_matrix3x2 &&
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 57adb3a3d5..c8a916b0e5 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -60,6 +60,7 @@ jobs:
     - name: Test stable
       run: |
         cargo test --target ${{ matrix.target }} -p windows-bindgen &&
+        cargo test --target ${{ matrix.target }} -p windows-interface &&
         cargo test --target ${{ matrix.target }} -p windows-metadata &&
         cargo test --target ${{ matrix.target }} -p windows-sys &&
         cargo test --target ${{ matrix.target }} -p windows-tokens &&
@@ -83,6 +84,7 @@ jobs:
         cargo test --target ${{ matrix.target }} -p test_enums &&
         cargo test --target ${{ matrix.target }} -p test_handles &&
         cargo test --target ${{ matrix.target }} -p test_helpers &&
+        cargo test --target ${{ matrix.target }} -p test_interface &&
         cargo test --target ${{ matrix.target }} -p test_interop &&
         cargo test --target ${{ matrix.target }} -p test_lib &&
         cargo test --target ${{ matrix.target }} -p test_matrix3x2 &&
diff --git a/crates/libs/interface/Cargo.toml b/crates/libs/interface/Cargo.toml
index 33635d51c7..9c9b50a53b 100644
--- a/crates/libs/interface/Cargo.toml
+++ b/crates/libs/interface/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "windows-interface"
 version = "0.32.0"
-edition = "2021"
+edition = "2018"
 authors = ["Microsoft"]
 license = "MIT OR Apache-2.0"
 description = "The interface macro for the windows crate"
diff --git a/crates/tests/interface/Cargo.toml b/crates/tests/interface/Cargo.toml
index 74241912a3..0fa79d7128 100644
--- a/crates/tests/interface/Cargo.toml
+++ b/crates/tests/interface/Cargo.toml
@@ -2,7 +2,7 @@
 name = "test_interface"
 version = "0.0.0"
 authors = ["Microsoft"]
-edition = "2021"
+edition = "2018"
 
 [dependencies.windows]
 path = "../../libs/windows"