diff --git a/google/default.go b/google/default.go
index 91b538b..b3e8783 100644
--- a/google/default.go
+++ b/google/default.go
@@ -13,6 +13,7 @@ import (
 	"os"
 	"path/filepath"
 	"runtime"
+	"time"
 
 	"cloud.google.com/go/compute/metadata"
 	"golang.org/x/oauth2"
@@ -68,6 +69,14 @@ type CredentialsParams struct {
 	// The OAuth2 TokenURL default override. This value overrides the default TokenURL,
 	// unless explicitly specified by the credentials config file. Optional.
 	TokenURL string
+
+	// EarlyTokenRefresh is the amount of time before a token expires that a new
+	// token will be preemptively fetched. If unset the default value is 10
+	// seconds.
+	//
+	// Note: This option is currently only respected when using credentials
+	// fetched from the GCE metadata server.
+	EarlyTokenRefresh time.Duration
 }
 
 func (params CredentialsParams) deepCopy() CredentialsParams {
@@ -155,7 +164,7 @@ func FindDefaultCredentialsWithParams(ctx context.Context, params CredentialsPar
 		id, _ := metadata.ProjectID()
 		return &Credentials{
 			ProjectID:   id,
-			TokenSource: ComputeTokenSource("", params.Scopes...),
+			TokenSource: computeTokenSource("", params.EarlyTokenRefresh, params.Scopes...),
 		}, nil
 	}
 
diff --git a/google/google.go b/google/google.go
index a1b629a..cc12238 100644
--- a/google/google.go
+++ b/google/google.go
@@ -231,7 +231,11 @@ func (f *credentialsFile) tokenSource(ctx context.Context, params CredentialsPar
 // Further information about retrieving access tokens from the GCE metadata
 // server can be found at https://cloud.google.com/compute/docs/authentication.
 func ComputeTokenSource(account string, scope ...string) oauth2.TokenSource {
-	return oauth2.ReuseTokenSource(nil, computeSource{account: account, scopes: scope})
+	return computeTokenSource(account, 0, scope...)
+}
+
+func computeTokenSource(account string, earlyExpiry time.Duration, scope ...string) oauth2.TokenSource {
+	return oauth2.ReuseTokenSourceWithExpiry(nil, computeSource{account: account, scopes: scope}, earlyExpiry)
 }
 
 type computeSource struct {