diff --git a/lib/rdf/PrefetchedDocumentLoader.ts b/lib/rdf/PrefetchedDocumentLoader.ts
index 65fb04b..169f064 100644
--- a/lib/rdf/PrefetchedDocumentLoader.ts
+++ b/lib/rdf/PrefetchedDocumentLoader.ts
@@ -17,6 +17,24 @@ export class PrefetchedDocumentLoader extends FetchDocumentLoader {
   public static readonly contextPattern: RegExp =
     /https:\/\/linkedsoftwaredependencies.org\/bundles\/npm\/componentsjs\/\^([0-9]+).0.0\/components\/context.jsonld/u;
 
+  /**
+   * @deprecated Use {@link PrefetchedDocumentLoader.cjsMajorVersion} instead.
+   */
+  // eslint-disable-next-line ts/naming-convention
+  public static readonly CJS_MAJOR_VERSION: number = PrefetchedDocumentLoader.cjsMajorVersion;
+
+  /**
+   * @deprecated Use {@link PrefetchedDocumentLoader.contextUrl} instead.
+   */
+  // eslint-disable-next-line ts/naming-convention
+  public static readonly CONTEXT_URL: string = PrefetchedDocumentLoader.contextUrl;
+
+  /**
+   * @deprecated Use {@link PrefetchedDocumentLoader.contextPattern} instead.
+   */
+  // eslint-disable-next-line ts/naming-convention
+  public static readonly CONTEXT_PATTERN: RegExp = PrefetchedDocumentLoader.contextPattern;
+
   private static readonly defaultContext: any = contextJson;
 
   private static readonly defaultContexts: Record<string, any> = {
diff --git a/test/unit/rdf/PrefetchedDocumentLoader-test.ts b/test/unit/rdf/PrefetchedDocumentLoader-test.ts
index 5ae816f..690421e 100644
--- a/test/unit/rdf/PrefetchedDocumentLoader-test.ts
+++ b/test/unit/rdf/PrefetchedDocumentLoader-test.ts
@@ -20,6 +20,14 @@ describe('PrefetchedDocumentLoader', () => {
     });
   });
 
+  describe('deprecated static fields', () => {
+    it('equal their renamed fields', () => {
+      expect(PrefetchedDocumentLoader.CJS_MAJOR_VERSION).toBe(PrefetchedDocumentLoader.cjsMajorVersion);
+      expect(PrefetchedDocumentLoader.CONTEXT_URL).toBe(PrefetchedDocumentLoader.contextUrl);
+      expect(PrefetchedDocumentLoader.CONTEXT_PATTERN).toBe(PrefetchedDocumentLoader.contextPattern);
+    });
+  });
+
   describe('load', () => {
     it('for a prefetched context', async() => {
       await expect(loader.load('http://example.org/context')).resolves
diff --git a/test/unit/rdf/RdfParser-test.ts b/test/unit/rdf/RdfParser-test.ts
index 4cba72f..15630d9 100644
--- a/test/unit/rdf/RdfParser-test.ts
+++ b/test/unit/rdf/RdfParser-test.ts
@@ -423,6 +423,17 @@ describe('RdfParser', () => {
     });
 
     it('for a Turtle stream with a slow import followed by an import to unknown file', async() => {
+      const parse = RdfParser.prototype.parse;
+      let resolveSlowImport: () => void;
+      const slowImportEnded = new Promise<void>(resolve => resolveSlowImport = resolve);
+      const parseSpy = jest.spyOn(RdfParser.prototype, 'parse')
+        .mockImplementation(function(this: RdfParser, textStream, parseOptions) {
+          const stream = parse.call(this, textStream, parseOptions);
+          if (parseOptions.path === 'http://example.org/myfileslow.ttl') {
+            stream.on('end', () => resolveSlowImport());
+          }
+          return stream;
+        });
       const options: RdfParserOptions = {
         path: 'path/to/file.ttl',
       };
@@ -431,6 +442,10 @@ describe('RdfParser', () => {
 `;
       await expect(arrayifyStream(parser.parse(streamifyString(doc), options))).rejects
         .toThrow(new Error(`Error while parsing file "path/to/file.ttl": URL not found: http://example.org/myfileunknown.ttl`));
+
+      // The slow import is still being parsed, so it must end before this test does
+      await slowImportEnded;
+      parseSpy.mockRestore();
     });
 
     it('for a Turtle stream with imports and a blank node prefix should derive prefixes for imports', async() => {