diff --git a/packages/firestore/src/protos/firestore_proto_api.ts b/packages/firestore/src/protos/firestore_proto_api.ts
index 6585004078e..9618d71b86a 100644
--- a/packages/firestore/src/protos/firestore_proto_api.ts
+++ b/packages/firestore/src/protos/firestore_proto_api.ts
@@ -399,7 +399,7 @@ export declare namespace firestoreV1ApiClientInterfaces {
     readTime?: Timestamp;
     targetId?: number;
     once?: boolean;
-    expectedCount?: number;
+    expectedCount?: number | { value: number };
   }
   interface TargetChange {
     targetChangeType?: TargetChangeTargetChangeType;
diff --git a/packages/firestore/src/protos/protos.json b/packages/firestore/src/protos/protos.json
index 61af4ae5dee..b2c50ccaeeb 100644
--- a/packages/firestore/src/protos/protos.json
+++ b/packages/firestore/src/protos/protos.json
@@ -928,6 +928,30 @@
                     }
                   }
                 },
+                "BitSequence": {
+                  "fields": {
+                    "bitmap": {
+                      "type": "bytes",
+                      "id": 1
+                    },
+                    "padding": {
+                      "type": "int32",
+                      "id": 2
+                    }
+                  }
+                },
+                "BloomFilter": {
+                  "fields": {
+                    "bits": {
+                      "type": "BitSequence",
+                      "id": 1
+                    },
+                    "hashCount": {
+                      "type": "int32",
+                      "id": 2
+                    }
+                  }
+                },
                 "DocumentMask": {
                   "fields": {
                     "fieldPaths": {
@@ -2052,6 +2076,10 @@
                     "once": {
                       "type": "bool",
                       "id": 6
+                    },
+                    "expectedCount": {
+                      "type": "google.protobuf.Int32Value",
+                      "id": 12
                     }
                   },
                   "nested": {
@@ -2660,6 +2688,10 @@
                     "count": {
                       "type": "int32",
                       "id": 2
+                    },
+                    "unchangedNames": {
+                      "type": "BloomFilter",
+                      "id": 3
                     }
                   }
                 }
diff --git a/packages/firestore/src/remote/serializer.ts b/packages/firestore/src/remote/serializer.ts
index 43292e1c456..39a787a943d 100644
--- a/packages/firestore/src/remote/serializer.ts
+++ b/packages/firestore/src/remote/serializer.ts
@@ -1051,7 +1051,10 @@ export function toTarget(
 
   if (targetData.resumeToken.approximateByteSize() > 0) {
     result.resumeToken = toBytes(serializer, targetData.resumeToken);
-    result.expectedCount = targetData.expectedCount ?? undefined;
+    const expectedCount = toInt32Proto(serializer, targetData.expectedCount);
+    if (expectedCount !== null) {
+      result.expectedCount = expectedCount;
+    }
   } else if (targetData.snapshotVersion.compareTo(SnapshotVersion.min()) > 0) {
     // TODO(wuandy): Consider removing above check because it is most likely true.
     // Right now, many tests depend on this behaviour though (leaving min() out
@@ -1060,7 +1063,10 @@ export function toTarget(
       serializer,
       targetData.snapshotVersion.toTimestamp()
     );
-    result.expectedCount = targetData.expectedCount ?? undefined;
+    const expectedCount = toInt32Proto(serializer, targetData.expectedCount);
+    if (expectedCount !== null) {
+      result.expectedCount = expectedCount;
+    }
   }
 
   return result;
diff --git a/packages/firestore/test/unit/remote/serializer.helper.ts b/packages/firestore/test/unit/remote/serializer.helper.ts
index a9b22a9555d..79140e73999 100644
--- a/packages/firestore/test/unit/remote/serializer.helper.ts
+++ b/packages/firestore/test/unit/remote/serializer.helper.ts
@@ -1778,8 +1778,7 @@ export function serializerTest(
             }
           },
           resumeToken: new Uint8Array([1, 2, 3]),
-          targetId: 1,
-          expectedCount: undefined
+          targetId: 1
         };
         expect(result).to.deep.equal(expected);
       });