diff --git a/src/data/dataMethods.ts b/src/data/dataMethods.ts
index c6a8301d..8f38a509 100644
--- a/src/data/dataMethods.ts
+++ b/src/data/dataMethods.ts
@@ -303,7 +303,10 @@ export function _requestObservable<R>(
   }
 
   // GROQ query-only parameters
-  if (['GET', 'HEAD'].indexOf(options.method || 'GET') >= 0 && uri.indexOf('/data/query/') === 0) {
+  if (
+    ['GET', 'HEAD', 'POST'].indexOf(options.method || 'GET') >= 0 &&
+    uri.indexOf('/data/query/') === 0
+  ) {
     if (config.resultSourceMap) {
       options.query = {resultSourceMap: true, ...options.query}
     }
diff --git a/test/client.test.ts b/test/client.test.ts
index 833d2d16..426dfda2 100644
--- a/test/client.test.ts
+++ b/test/client.test.ts
@@ -470,6 +470,27 @@ describe('client', async () => {
       expect(res[0].rating, 'data should match').toBe(5)
     })
 
+    test.skipIf(isEdge)(
+      'can query for documents with resultSourceMap and perspective',
+      async () => {
+        nock(projectHost())
+          .get(`/v1/data/query/foo?query=*&resultSourceMap=true&perspective=previewDrafts`)
+          .reply(200, {
+            ms: 123,
+            query: '*',
+            result: [{_id: 'njgNkngskjg', rating: 5}],
+          })
+
+        const client = getClient({
+          resultSourceMap: true,
+          perspective: 'previewDrafts',
+        })
+        const res = await client.fetch('*', {})
+        expect(res.length, 'length should match').toBe(1)
+        expect(res[0].rating, 'data should match').toBe(5)
+      }
+    )
+
     test.skipIf(isEdge)('throws on invalid request tag on request', () => {
       nock(projectHost())
         .get(`/v1/data/query/foo?query=*&tag=mycompany.syncjob`)
@@ -1240,6 +1261,38 @@ describe('client', async () => {
       }
     )
 
+    test.skipIf(isEdge)(
+      'uses POST for long queries, but puts resultSourceMap and perspective as query params',
+      async () => {
+        const clause: string[] = []
+        const params: Record<string, string> = {}
+        for (let i = 1766; i <= 2016; i++) {
+          clause.push(`title == $beerName${i}`)
+          params[`beerName${i}`] = `some beer ${i}`
+        }
+
+        // Again, just... don't do this.
+        const query = `*[_type == "beer" && (${clause.join(' || ')})]`
+
+        nock(projectHost())
+          .filteringRequestBody(/.*/, '*')
+          .post('/v1/data/query/foo?resultSourceMap=true&perspective=previewDrafts', '*')
+          .reply(200, {
+            ms: 123,
+            query: query,
+            result: [{_id: 'njgNkngskjg', rating: 5}],
+          })
+
+        const client = getClient({
+          perspective: 'previewDrafts',
+          resultSourceMap: true,
+        })
+        const res = await client.fetch(query, params)
+        expect(res.length, 'length should match').toEqual(1)
+        expect(res[0].rating, 'data should match').toEqual(5)
+      }
+    )
+
     test.skipIf(isEdge)('uses POST for long queries also towards CDN', async () => {
       const client = createClient({projectId: 'abc123', dataset: 'foo', useCdn: true})