diff --git a/pkg/builder/prefetching_build_executor.go b/pkg/builder/prefetching_build_executor.go
index f93378f6..fa741051 100644
--- a/pkg/builder/prefetching_build_executor.go
+++ b/pkg/builder/prefetching_build_executor.go
@@ -152,11 +152,13 @@ func (be *prefetchingBuildExecutor) Execute(ctx context.Context, filePool pool.F
 		return nil
 	})
 
-	if err := group.Wait(); err == nil {
+	err = group.Wait()
+	newProfile := be.computeProfile(bloomFilterMonitor)
+	if err == nil {
 		// Action completed successfully. Store an updated
 		// profile in the File System Access Cache if it is
 		// different from the one fetched previously.
-		if newProfile := be.computeProfile(bloomFilterMonitor); !proto.Equal(existingProfile, newProfile) {
+		if !proto.Equal(existingProfile, newProfile) {
 			if err := be.fileSystemAccessCache.Put(ctx, reducedActionDigest, buffer.NewProtoBufferFromProto(newProfile, buffer.UserProvided)); err != nil {
 				attachErrorToExecuteResponse(response, util.StatusWrap(err, "Failed to store file system access profile"))
 			}
@@ -165,6 +167,11 @@ func (be *prefetchingBuildExecutor) Execute(ctx context.Context, filePool pool.F
 		response.Status = status.Convert(err).Proto()
 	}
 
+	if newProfilePb, err := anypb.New(newProfile); err == nil {
+		response.Result.ExecutionMetadata.AuxiliaryMetadata = append(response.Result.ExecutionMetadata.AuxiliaryMetadata, newProfilePb)
+	} else {
+		attachErrorToExecuteResponse(response, util.StatusWrap(err, "Failed to marshal file system access profile"))
+	}
 	if resourceUsage, err := anypb.New(bloomFilterMonitor.GetInputRootResourceUsage()); err == nil {
 		response.Result.ExecutionMetadata.AuxiliaryMetadata = append(response.Result.ExecutionMetadata.AuxiliaryMetadata, resourceUsage)
 	} else {
diff --git a/pkg/builder/prefetching_build_executor_test.go b/pkg/builder/prefetching_build_executor_test.go
index d6ed0c88..debfdc32 100644
--- a/pkg/builder/prefetching_build_executor_test.go
+++ b/pkg/builder/prefetching_build_executor_test.go
@@ -49,6 +49,10 @@ func TestPrefetchingBuildExecutor(t *testing.T) {
 	digestFunction := digest.MustNewFunction("hello", remoteexecution.DigestFunction_MD5)
 	executionStateUpdates := make(chan<- *remoteworker.CurrentState_Executing)
 
+	defaultFileSystemAccessProfile, err := anypb.New(&fsac.FileSystemAccessProfile{
+		BloomFilter:              []byte{0x80},
+		BloomFilterHashFunctions: 1,
+	})
 	defaultInputRootResourceUsage, err := anypb.New(&resourceusage.InputRootResourceUsage{
 		DirectoriesResolved: 1,
 		DirectoriesRead:     0,
@@ -207,7 +211,7 @@ func TestPrefetchingBuildExecutor(t *testing.T) {
 			&remoteexecution.ExecuteResponse{
 				Result: &remoteexecution.ActionResult{
 					ExecutionMetadata: &remoteexecution.ExecutedActionMetadata{
-						AuxiliaryMetadata: []*anypb.Any{defaultInputRootResourceUsage},
+						AuxiliaryMetadata: []*anypb.Any{defaultFileSystemAccessProfile, defaultInputRootResourceUsage},
 					},
 				},
 				Status: status.New(codes.Internal, "Failed to fetch file system access profile: Storage offline").Proto(),
@@ -256,7 +260,7 @@ func TestPrefetchingBuildExecutor(t *testing.T) {
 			&remoteexecution.ExecuteResponse{
 				Result: &remoteexecution.ActionResult{
 					ExecutionMetadata: &remoteexecution.ExecutedActionMetadata{
-						AuxiliaryMetadata: []*anypb.Any{defaultInputRootResourceUsage},
+						AuxiliaryMetadata: []*anypb.Any{defaultFileSystemAccessProfile, defaultInputRootResourceUsage},
 					},
 				},
 				Status: status.New(codes.Internal, "Failed to prefetch directory \".\": Storage offline").Proto(),
@@ -317,7 +321,7 @@ func TestPrefetchingBuildExecutor(t *testing.T) {
 			&remoteexecution.ExecuteResponse{
 				Result: &remoteexecution.ActionResult{
 					ExecutionMetadata: &remoteexecution.ExecutedActionMetadata{
-						AuxiliaryMetadata: []*anypb.Any{defaultInputRootResourceUsage},
+						AuxiliaryMetadata: []*anypb.Any{defaultFileSystemAccessProfile, defaultInputRootResourceUsage},
 					},
 				},
 				Status: status.New(codes.Internal, "Failed to prefetch file \"hello.txt\": Storage offline").Proto(),
@@ -366,7 +370,7 @@ func TestPrefetchingBuildExecutor(t *testing.T) {
 			&remoteexecution.ExecuteResponse{
 				Result: &remoteexecution.ActionResult{
 					ExecutionMetadata: &remoteexecution.ExecutedActionMetadata{
-						AuxiliaryMetadata: []*anypb.Any{defaultInputRootResourceUsage},
+						AuxiliaryMetadata: []*anypb.Any{defaultFileSystemAccessProfile, defaultInputRootResourceUsage},
 					},
 				},
 				Status: status.New(codes.Internal, "Failed to store file system access profile: Storage offline").Proto(),
@@ -408,7 +412,7 @@ func TestPrefetchingBuildExecutor(t *testing.T) {
 			&remoteexecution.ExecuteResponse{
 				Result: &remoteexecution.ActionResult{
 					ExecutionMetadata: &remoteexecution.ExecutedActionMetadata{
-						AuxiliaryMetadata: []*anypb.Any{defaultInputRootResourceUsage},
+						AuxiliaryMetadata: []*anypb.Any{defaultFileSystemAccessProfile, defaultInputRootResourceUsage},
 					},
 				},
 			},
@@ -456,7 +460,11 @@ func TestPrefetchingBuildExecutor(t *testing.T) {
 				}, profile)
 				return nil
 			})
-
+		fileSystemAccessProfile, err := anypb.New(&fsac.FileSystemAccessProfile{
+			BloomFilter:              []byte{0x0b, 0x2a},
+			BloomFilterHashFunctions: 9,
+		})
+		require.NoError(t, err)
 		inputRootResourceUsage, err := anypb.New(&resourceusage.InputRootResourceUsage{
 			DirectoriesResolved: 1,
 			DirectoriesRead:     1,
@@ -468,7 +476,7 @@ func TestPrefetchingBuildExecutor(t *testing.T) {
 			&remoteexecution.ExecuteResponse{
 				Result: &remoteexecution.ActionResult{
 					ExecutionMetadata: &remoteexecution.ExecutedActionMetadata{
-						AuxiliaryMetadata: []*anypb.Any{inputRootResourceUsage},
+						AuxiliaryMetadata: []*anypb.Any{fileSystemAccessProfile, inputRootResourceUsage},
 					},
 				},
 			},