diff --git a/lib/create-contentful-api.ts b/lib/create-contentful-api.ts
index 8a2306ce2..0c6c83d23 100644
--- a/lib/create-contentful-api.ts
+++ b/lib/create-contentful-api.ts
@@ -36,6 +36,7 @@ import {
 } from './utils/validate-params'
 import validateSearchParameters from './utils/validate-search-parameters'
 import validateTimestamp from './utils/validate-timestamp'
+import getQuerySelectionSet from './utils/query-selection-set'
 
 const ASSET_KEY_MAX_LIFETIME = 48 * 60 * 60
 
@@ -107,6 +108,15 @@ export default function createContentfulApi<OptionType extends ChainOptions>(
 
     if (areAllowed) {
       query.includeContentSourceMaps = true
+
+      // Ensure that content source maps and required attributes are selected
+      if (query.select) {
+        const selection = getQuerySelectionSet(query)
+
+        selection.add('sys')
+
+        query.select = Array.from(selection).join(',')
+      }
     }
 
     return query
diff --git a/lib/utils/normalize-select.ts b/lib/utils/normalize-select.ts
index bd129abfd..7b99a30b5 100644
--- a/lib/utils/normalize-select.ts
+++ b/lib/utils/normalize-select.ts
@@ -1,3 +1,5 @@
+import getQuerySelectionSet from './query-selection-set'
+
 /*
  * sdk relies heavily on sys metadata
  * so we cannot omit the sys property on sdk level entirely
@@ -9,13 +11,7 @@ export default function normalizeSelect(query) {
     return query
   }
 
-  // The selection of fields for the query is limited
-  // Get the different parts that are listed for selection
-  const allSelects = Array.isArray(query.select)
-    ? query.select
-    : query.select.split(',').map((q) => q.trim())
-  // Move the parts into a set for easy access and deduplication
-  const selectedSet = new Set(allSelects)
+  const selectedSet = getQuerySelectionSet(query)
 
   // If we already select all of `sys` we can just return
   // since we're anyway fetching everything that is needed
diff --git a/lib/utils/query-selection-set.ts b/lib/utils/query-selection-set.ts
new file mode 100644
index 000000000..81ac56a4f
--- /dev/null
+++ b/lib/utils/query-selection-set.ts
@@ -0,0 +1,14 @@
+export default function getQuerySelectionSet(query: Record<string, any>): Set<string> {
+  if (!query.select) {
+    return new Set()
+  }
+
+  // The selection of fields for the query is limited
+  // Get the different parts that are listed for selection
+  const allSelects = Array.isArray(query.select)
+    ? query.select
+    : query.select.split(',').map((q) => q.trim())
+
+  // Move the parts into a set for easy access and deduplication
+  return new Set(allSelects)
+}
diff --git a/test/integration/getAssets.test.ts b/test/integration/getAssets.test.ts
index fe836ff29..2daa4d93c 100644
--- a/test/integration/getAssets.test.ts
+++ b/test/integration/getAssets.test.ts
@@ -47,32 +47,51 @@ describe('getAssets', () => {
       await expect(invalidClient.getAssets()).rejects.toThrow(ValidationError)
     })
 
-    test('preview client', async () => {
-      const response = await previewClient.getAssets()
+    describe('preview client', () => {
+      it('requests content source maps', async () => {
+        const response = await previewClient.getAssets()
 
-      expect(response.items).not.toHaveLength(0)
+        expect(response.items).not.toHaveLength(0)
 
-      response.items.forEach((item) => {
-        expect(item.sys.type).toEqual('Asset')
-        expect(item.fields).toBeDefined()
-        expect(typeof item.fields.title).toBe('string')
+        response.items.forEach((item) => {
+          expect(item.sys.type).toEqual('Asset')
+          expect(item.fields).toBeDefined()
+          expect(typeof item.fields.title).toBe('string')
+        })
+
+        expect(response.sys?.contentSourceMapsLookup).toBeDefined()
       })
 
-      expect(response.sys?.contentSourceMapsLookup).toBeDefined()
-    })
+      it('enforces selection of sys if query.select is present', async () => {
+        const response = await previewClient.getAssets({
+          select: ['fields.title', 'sys.id', 'sys.type'],
+        })
 
-    test('preview client withAllLocales modifier', async () => {
-      const response = await previewClient.withAllLocales.getAssets()
+        expect(response.items).not.toHaveLength(0)
 
-      expect(response.items).not.toHaveLength(0)
+        response.items.forEach((item) => {
+          expect(item.sys.type).toEqual('Asset')
+          expect(item.fields).toBeDefined()
+          expect(typeof item.fields.title).toBe('string')
+          expect(item.sys.contentSourceMaps).toBeDefined()
+        })
 
-      response.items.forEach((item) => {
-        expect(item.sys.type).toEqual('Asset')
-        expect(item.fields).toBeDefined()
-        expect(typeof item.fields.title).toBe('object')
+        expect(response.sys?.contentSourceMapsLookup).toBeDefined()
       })
 
-      expect(response.sys?.contentSourceMapsLookup).toBeDefined()
+      it('works with withAllLocales modifier', async () => {
+        const response = await previewClient.withAllLocales.getAssets()
+
+        expect(response.items).not.toHaveLength(0)
+
+        response.items.forEach((item) => {
+          expect(item.sys.type).toEqual('Asset')
+          expect(item.fields).toBeDefined()
+          expect(typeof item.fields.title).toBe('object')
+        })
+
+        expect(response.sys?.contentSourceMapsLookup).toBeDefined()
+      })
     })
   })
 })
diff --git a/test/integration/getEntries.test.ts b/test/integration/getEntries.test.ts
index 161a1f1ba..dc30f698e 100644
--- a/test/integration/getEntries.test.ts
+++ b/test/integration/getEntries.test.ts
@@ -392,6 +392,16 @@ describe('getEntries via client chain modifiers', () => {
       assertCSMEntriesResponse(response)
     })
 
+    test('enforces entry.sys when query.select is defined', async () => {
+      const response = await previewClient.getEntries({
+        include: 5,
+        'sys.id': entryWithResolvableLink,
+        select: ['fields', 'metadata.tags'],
+      })
+
+      assertCSMEntriesResponse(response)
+    })
+
     test('withAllLocales modifier', async () => {
       const response = await previewClient.withAllLocales.getEntries({
         include: 5,