diff --git a/.changeset/quick-radios-obey.md b/.changeset/quick-radios-obey.md
new file mode 100644
index 00000000000..83e452264a5
--- /dev/null
+++ b/.changeset/quick-radios-obey.md
@@ -0,0 +1,5 @@
+---
+"@firebase/firestore": patch
+---
+
+Update canonifyFilter to compute the canonization for flat conjunctions the same as implicit AND queries.
diff --git a/packages/firestore/src/core/filter.ts b/packages/firestore/src/core/filter.ts
index 4322c926658..16bb627f2dc 100644
--- a/packages/firestore/src/core/filter.ts
+++ b/packages/firestore/src/core/filter.ts
@@ -325,6 +325,14 @@ export function canonifyFilter(filter: Filter): string {
       filter.op.toString() +
       canonicalId(filter.value)
     );
+  } else if (compositeFilterIsFlatConjunction(filter)) {
+    // Older SDK versions use an implicit AND operation between their filters.
+    // In the new SDK versions, the developer may use an explicit AND filter.
+    // To stay consistent with the old usages, we add a special case to ensure
+    // the canonical ID for these two are the same. For example:
+    // `col.whereEquals("a", 1).whereEquals("b", 2)` should have the same
+    // canonical ID as `col.where(and(equals("a",1), equals("b",2)))`.
+    return filter.filters.map(filter => canonifyFilter(filter)).join(',');
   } else {
     // filter instanceof CompositeFilter
     const canonicalIdsString = filter.filters
diff --git a/packages/firestore/src/lite-api/query.ts b/packages/firestore/src/lite-api/query.ts
index 2f1d7ecbf8f..0b3de2268d0 100644
--- a/packages/firestore/src/lite-api/query.ts
+++ b/packages/firestore/src/lite-api/query.ts
@@ -364,13 +364,14 @@ export type QueryFilterConstraint =
   | QueryCompositeFilterConstraint;
 
 /**
- * Creates a {@link QueryCompositeFilterConstraint} that performs a logical OR
- * of all the provided {@link QueryFilterConstraint}s.
+ * Creates a new {@link QueryCompositeFilterConstraint} that is a disjunction of
+ * the given filter constraints. A disjunction filter includes a document if it
+ * satisfies any of the given filters.
  *
- * @param queryConstraints - Optional. The {@link QueryFilterConstraint}s
- * for OR operation. These must be created with calls to {@link where},
- * {@link or}, or {@link and}.
- * @returns The created {@link QueryCompositeFilterConstraint}.
+ * @param queryConstraints - Optional. The list of
+ * {@link QueryFilterConstraint}s to perform a disjunction for. These must be
+ * created with calls to {@link where}, {@link or}, or {@link and}.
+ * @returns The newly created {@link QueryCompositeFilterConstraint}.
  * @internal TODO remove this internal tag with OR Query support in the server
  */
 export function or(
@@ -388,13 +389,14 @@ export function or(
 }
 
 /**
- * Creates a {@link QueryCompositeFilterConstraint} that performs a logical AND
- * of all the provided {@link QueryFilterConstraint}s.
+ * Creates a new {@link QueryCompositeFilterConstraint} that is a conjunction of
+ * the given filter constraints. A conjunction filter includes a document if it
+ * satisfies all of the given filters.
  *
- * @param queryConstraints - Optional. The {@link QueryFilterConstraint}s
- * for AND operation. These must be created with calls to {@link where},
- * {@link or}, or {@link and}.
- * @returns The created {@link QueryCompositeFilterConstraint}.
+ * @param queryConstraints - Optional. The list of
+ * {@link QueryFilterConstraint}s to perform a conjunction for. These must be
+ * created with calls to {@link where}, {@link or}, or {@link and}.
+ * @returns The newly created {@link QueryCompositeFilterConstraint}.
  * @internal TODO remove this internal tag with OR Query support in the server
  */
 export function and(
diff --git a/packages/firestore/test/unit/core/filter.test.ts b/packages/firestore/test/unit/core/filter.test.ts
index 3011e3f1647..a8ea6277c9a 100644
--- a/packages/firestore/test/unit/core/filter.test.ts
+++ b/packages/firestore/test/unit/core/filter.test.ts
@@ -25,7 +25,9 @@ import {
   FieldFilter,
   Operator
 } from '../../../src/core/filter';
-import { andFilter, filter, orFilter } from '../../util/helpers';
+import { queryToTarget } from '../../../src/core/query';
+import { canonifyTarget } from '../../../src/core/target';
+import { andFilter, filter, orFilter, query } from '../../util/helpers';
 
 describe('FieldFilter', () => {
   it('exposes field filter members', () => {
@@ -93,4 +95,14 @@ describe('CompositeFilter', () => {
     expect(compositeFilterIsFlat(orFilter2)).false;
     expect(compositeFilterIsFlatConjunction(orFilter2)).false;
   });
+
+  it('computes canonical id of flat conjunctions', () => {
+    const target1 = query('col', a, b, c);
+
+    const target2 = query('col', andFilter(a, b, c));
+
+    expect(canonifyTarget(queryToTarget(target1))).to.equal(
+      canonifyTarget(queryToTarget(target2))
+    );
+  });
 });