diff --git a/plugins/extractors/optimus/README.md b/plugins/extractors/optimus/README.md
index cafacd44..5801fb2e 100644
--- a/plugins/extractors/optimus/README.md
+++ b/plugins/extractors/optimus/README.md
@@ -14,6 +14,7 @@ source:
 | Key | Value | Example | Description |    |
 | :-- | :---- | :------ | :---------- | :- |
 | `host` | `string` | `optimus.com:80` | Optimus' GRPC host | *required* |
+| `max_size_in_mb` | `int` | `45` | Max megabytes for GRPC client to receive message. Default to 45. |  |
 
 ## Outputs
 
diff --git a/plugins/extractors/optimus/client.go b/plugins/extractors/optimus/client.go
index 7fa612f4..12048025 100644
--- a/plugins/extractors/optimus/client.go
+++ b/plugins/extractors/optimus/client.go
@@ -14,10 +14,10 @@ import (
 )
 
 const (
-	service                    = "optimus"
-	GRPCMaxClientSendSize      = 45 << 20 // 45MB
-	GRPCMaxClientRecvSize      = 45 << 20 // 45MB
-	GRPCMaxRetry          uint = 3
+	service                      = "optimus"
+	GRPCMaxClientSendSizeMB      = 45
+	GRPCMaxClientRecvSizeMB      = 45
+	GRPCMaxRetry            uint = 3
 )
 
 type Client interface {
@@ -25,7 +25,7 @@ type Client interface {
 	pb.ProjectServiceClient
 	pb.JobSpecificationServiceClient
 	pb.JobRunServiceClient
-	Connect(ctx context.Context, host string) error
+	Connect(ctx context.Context, host string, maxSizeInMB int) error
 	Close() error
 }
 
@@ -41,11 +41,11 @@ type client struct {
 	conn *grpc.ClientConn
 }
 
-func (c *client) Connect(ctx context.Context, host string) (err error) {
+func (c *client) Connect(ctx context.Context, host string, maxSizeInMB int) (err error) {
 	dialTimeoutCtx, dialCancel := context.WithTimeout(ctx, time.Second*2)
 	defer dialCancel()
 
-	if c.conn, err = c.createConnection(dialTimeoutCtx, host); err != nil {
+	if c.conn, err = c.createConnection(dialTimeoutCtx, host, maxSizeInMB); err != nil {
 		err = errors.Wrap(err, "error creating connection")
 		return
 	}
@@ -62,7 +62,11 @@ func (c *client) Close() error {
 	return c.conn.Close()
 }
 
-func (c *client) createConnection(ctx context.Context, host string) (*grpc.ClientConn, error) {
+func (c *client) createConnection(ctx context.Context, host string, maxSizeInMB int) (*grpc.ClientConn, error) {
+	if maxSizeInMB <= 0 {
+		maxSizeInMB = GRPCMaxClientRecvSizeMB
+	}
+
 	retryOpts := []grpc_retry.CallOption{
 		grpc_retry.WithBackoff(grpc_retry.BackoffExponential(100 * time.Millisecond)),
 		grpc_retry.WithMax(GRPCMaxRetry),
@@ -72,8 +76,8 @@ func (c *client) createConnection(ctx context.Context, host string) (*grpc.Clien
 		grpc.WithInsecure(),
 		grpc.WithBlock(),
 		grpc.WithDefaultCallOptions(
-			grpc.MaxCallSendMsgSize(GRPCMaxClientSendSize),
-			grpc.MaxCallRecvMsgSize(GRPCMaxClientRecvSize),
+			grpc.MaxCallSendMsgSize(GRPCMaxClientSendSizeMB<<20),
+			grpc.MaxCallRecvMsgSize(maxSizeInMB<<20),
 		),
 		grpc.WithUnaryInterceptor(grpc_middleware.ChainUnaryClient(
 			grpc_retry.UnaryClientInterceptor(retryOpts...),
diff --git a/plugins/extractors/optimus/optimus.go b/plugins/extractors/optimus/optimus.go
index 4c6c3635..efee1091 100644
--- a/plugins/extractors/optimus/optimus.go
+++ b/plugins/extractors/optimus/optimus.go
@@ -23,7 +23,8 @@ var summary string
 
 // Config holds the set of configuration for the bigquery extractor
 type Config struct {
-	Host string `mapstructure:"host" validate:"required"`
+	Host        string `mapstructure:"host" validate:"required"`
+	MaxSizeInMB int    `mapstructure:"max_size_in_mb"`
 }
 
 var sampleConfig = `
@@ -64,7 +65,7 @@ func (e *Extractor) Init(ctx context.Context, configMap map[string]interface{})
 		return plugins.InvalidConfigError{}
 	}
 
-	if err := e.client.Connect(ctx, e.config.Host); err != nil {
+	if err := e.client.Connect(ctx, e.config.Host, e.config.MaxSizeInMB); err != nil {
 		return errors.Wrap(err, "error connecting to host")
 	}
 
diff --git a/plugins/extractors/optimus/optimus_test.go b/plugins/extractors/optimus/optimus_test.go
index efb995a4..0f915a21 100644
--- a/plugins/extractors/optimus/optimus_test.go
+++ b/plugins/extractors/optimus/optimus_test.go
@@ -38,7 +38,7 @@ func TestInit(t *testing.T) {
 		ctx := context.TODO()
 
 		client := new(mockClient)
-		client.On("Connect", ctx, validConfig["host"]).Return(nil)
+		client.On("Connect", ctx, validConfig["host"], 0).Return(nil)
 		defer client.AssertExpectations(t)
 
 		extr := optimus.New(testutils.Logger, client)
@@ -78,8 +78,8 @@ type mockClient struct {
 	mock.Mock
 }
 
-func (c *mockClient) Connect(ctx context.Context, host string) (err error) {
-	args := c.Called(ctx, host)
+func (c *mockClient) Connect(ctx context.Context, host string, maxSizeInMB int) (err error) {
+	args := c.Called(ctx, host, maxSizeInMB)
 
 	return args.Error(0)
 }
@@ -118,7 +118,7 @@ func (c *mockClient) GetJobTask(
 }
 
 func setupExtractExpectation(ctx context.Context, client *mockClient) {
-	client.On("Connect", ctx, validConfig["host"]).Return(nil).Once()
+	client.On("Connect", ctx, validConfig["host"], 0).Return(nil).Once()
 
 	client.On("ListProjects", ctx, &pb.ListProjectsRequest{}, mock.Anything).Return(&pb.ListProjectsResponse{
 		Projects: []*pb.ProjectSpecification{