diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index b2814580..1a1c09cd 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -37,6 +37,22 @@ jobs:
         working-directory: ./lib/spargebra
       - run: cargo clippy --all-targets --all-features
 
+  clippy_msv:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v3
+        with:
+          submodules: true
+      - run: rustup override set 1.60.0 && rustup component add clippy
+      - run: cargo clippy --  -D warnings -D clippy::all
+        working-directory: ./lib/oxrdf
+      - run: cargo clippy -- -D warnings -D clippy::all
+        working-directory: ./lib/sparesults
+      - run: cargo clippy -- -D warnings -D clippy::all
+        working-directory: ./lib/spargebra
+      - run: cargo clippy -- -D warnings -D clippy::all
+        working-directory: ./server
+
   deny:
     runs-on: ubuntu-latest
     steps:
diff --git a/lib/sparesults/src/json.rs b/lib/sparesults/src/json.rs
index dad446c8..ded01047 100644
--- a/lib/sparesults/src/json.rs
+++ b/lib/sparesults/src/json.rs
@@ -274,8 +274,11 @@ impl<R: BufRead> JsonSolutionsReader<R> {
         let mut value = None;
         let mut lang = None;
         let mut datatype = None;
+        #[cfg(feature = "rdf-star")]
         let mut subject = None;
+        #[cfg(feature = "rdf-star")]
         let mut predicate = None;
+        #[cfg(feature = "rdf-star")]
         let mut object = None;
         if self.reader.read_event(&mut self.buffer)? != JsonEvent::StartObject {
             return Err(SyntaxError::msg("Term serializations should be an object").into());
@@ -287,10 +290,13 @@ impl<R: BufRead> JsonSolutionsReader<R> {
                     "value" => state = Some(State::Value),
                     "xml:lang" => state = Some(State::Lang),
                     "datatype" => state = Some(State::Datatype),
+                    #[cfg(feature = "rdf-star")]
                     "subject" => subject = Some(self.read_value(number_of_recursive_calls + 1)?),
+                    #[cfg(feature = "rdf-star")]
                     "predicate" => {
                         predicate = Some(self.read_value(number_of_recursive_calls + 1)?)
                     }
+                    #[cfg(feature = "rdf-star")]
                     "object" => object = Some(self.read_value(number_of_recursive_calls + 1)?),
                     _ => {
                         return Err(SyntaxError::msg(format!(
diff --git a/server/src/main.rs b/server/src/main.rs
index addfd0a7..35840e89 100644
--- a/server/src/main.rs
+++ b/server/src/main.rs
@@ -302,7 +302,7 @@ fn handle_request(request: &mut Request, store: Store) -> Result<Response, HttpE
                     request,
                 )
             } else {
-                return Err(unsupported_media_type(&content_type));
+                Err(unsupported_media_type(&content_type))
             }
         }
         (path, "GET") if path.starts_with("/store") => {