diff --git a/packages/dataset-registry-client/src/client.ts b/packages/dataset-registry-client/src/client.ts
index e477a213..ae0c2f82 100644
--- a/packages/dataset-registry-client/src/client.ts
+++ b/packages/dataset-registry-client/src/client.ts
@@ -54,7 +54,7 @@ export class Client {
               distributions: dataset.distribution.map((d) => {
                 const distribution = new Distribution(
                   new URL(d.accessURL),
-                  d.mediaType,
+                  d.mediaType ?? undefined,
                   d.conformsTo ? new URL(d.conformsTo) : undefined
                 );
                 distribution.byteSize = d.byteSize ?? undefined;
diff --git a/packages/dataset-registry-client/src/schema.ts b/packages/dataset-registry-client/src/schema.ts
index efab3d0a..8e772393 100644
--- a/packages/dataset-registry-client/src/schema.ts
+++ b/packages/dataset-registry-client/src/schema.ts
@@ -48,7 +48,10 @@ export const DatasetSchema = {
     '@schema': {
       '@type': dcat.Distribution,
       accessURL: dcat.accessURL,
-      mediaType: dcat.mediaType,
+      mediaType: {
+        '@id': dcat.mediaType,
+        '@optional': true,
+      },
       byteSize: {
         '@id': dcat.byteSize,
         '@type': xsd.nonNegativeInteger,
diff --git a/packages/dataset-registry-client/test/fixtures/registry.ttl b/packages/dataset-registry-client/test/fixtures/registry.ttl
index f41fc063..19ad94b4 100644
--- a/packages/dataset-registry-client/test/fixtures/registry.ttl
+++ b/packages/dataset-registry-client/test/fixtures/registry.ttl
@@ -27,7 +27,6 @@
   dcat:distribution [
     a dcat:Distribution ;
     dcat:accessURL <http://bar.org/sparql2> ;
-    dcat:mediaType "application/sparql-query" ;
     dct:modified "2022-12-03T10:26"^^xsd:dateTime ;
   ] , [
     a dcat:Distribution ;
diff --git a/packages/dataset/src/distribution.ts b/packages/dataset/src/distribution.ts
index 9ea8202c..8b35edf5 100644
--- a/packages/dataset/src/distribution.ts
+++ b/packages/dataset/src/distribution.ts
@@ -9,7 +9,7 @@ export class Distribution {
 
   constructor(
     public readonly accessUrl: URL,
-    public readonly mimeType: string,
+    public readonly mimeType?: string,
     public readonly conformsTo?: URL
   ) {}
 
diff --git a/packages/sparql-qlever/src/importer.ts b/packages/sparql-qlever/src/importer.ts
index c9046762..f927e494 100644
--- a/packages/sparql-qlever/src/importer.ts
+++ b/packages/sparql-qlever/src/importer.ts
@@ -48,7 +48,12 @@ export class Importer implements ImporterInterface {
   public async import(
     dataset: Dataset
   ): Promise<NotSupported | ImportSuccessful | ImportFailed> {
-    const downloadDistributions = dataset.getDownloadDistributions();
+    const downloadDistributions = dataset
+      .getDownloadDistributions()
+      .filter(
+        (distribution): distribution is Distribution & { mimeType: string } =>
+          distribution.mimeType !== undefined
+      );
     if (downloadDistributions.length === 0) {
       return new NotSupported();
     }
@@ -75,7 +80,7 @@ export class Importer implements ImporterInterface {
   }
 
   private async doImport(
-    distribution: Distribution
+    distribution: Distribution & { mimeType: string }
   ): Promise<ImportSuccessful | ImportFailed> {
     const localFile = await this.downloader.download(distribution);
     await this.index(
diff --git a/packages/sparql-qlever/tsconfig.json b/packages/sparql-qlever/tsconfig.json
index f50ff318..2bbab6fc 100644
--- a/packages/sparql-qlever/tsconfig.json
+++ b/packages/sparql-qlever/tsconfig.json
@@ -10,19 +10,19 @@
       "path": "../task-runner-docker"
     },
     {
-      "path": "../sparql-server"
+      "path": "../dataset"
     },
     {
       "path": "../task-runner"
     },
     {
-      "path": "../distribution-downloader"
+      "path": "../sparql-server"
     },
     {
-      "path": "../dataset"
+      "path": "../sparql-importer"
     },
     {
-      "path": "../sparql-importer"
+      "path": "../distribution-downloader"
     },
     {
       "path": "./tsconfig.lib.json"
diff --git a/packages/sparql-qlever/tsconfig.lib.json b/packages/sparql-qlever/tsconfig.lib.json
index 5e2e9bb0..a194f115 100644
--- a/packages/sparql-qlever/tsconfig.lib.json
+++ b/packages/sparql-qlever/tsconfig.lib.json
@@ -17,19 +17,19 @@
       "path": "../task-runner-docker/tsconfig.lib.json"
     },
     {
-      "path": "../sparql-server/tsconfig.lib.json"
+      "path": "../dataset/tsconfig.lib.json"
     },
     {
       "path": "../task-runner/tsconfig.lib.json"
     },
     {
-      "path": "../distribution-downloader/tsconfig.lib.json"
+      "path": "../sparql-server/tsconfig.lib.json"
     },
     {
-      "path": "../dataset/tsconfig.lib.json"
+      "path": "../sparql-importer/tsconfig.lib.json"
     },
     {
-      "path": "../sparql-importer/tsconfig.lib.json"
+      "path": "../distribution-downloader/tsconfig.lib.json"
     }
   ],
   "exclude": [
diff --git a/packages/sparql-qlever/vite.config.ts b/packages/sparql-qlever/vite.config.ts
index 394801b6..dc072951 100644
--- a/packages/sparql-qlever/vite.config.ts
+++ b/packages/sparql-qlever/vite.config.ts
@@ -13,10 +13,10 @@ export default mergeConfig(
       },
       coverage: {
         thresholds: {
-          lines: 87.38,
+          lines: 87.93,
           functions: 100,
-          branches: 50,
-          statements: 87.38,
+          branches: 52.17,
+          statements: 87.93,
         },
       },
     },