diff --git a/src/database/sql/fakedb_test.go b/src/database/sql/fakedb_test.go
index 171c322d49a..a993fd46ede 100644
--- a/src/database/sql/fakedb_test.go
+++ b/src/database/sql/fakedb_test.go
@@ -141,6 +141,8 @@ type Dummy struct {
 }
 
 func TestDrivers(t *testing.T) {
+	unregisterAllDrivers()
+	Register("test", fdriver)
 	Register("invalid", Dummy{})
 	all := Drivers()
 	if len(all) < 2 || !sort.StringsAreSorted(all) || !contains(all, "test") || !contains(all, "invalid") {
diff --git a/src/database/sql/sql.go b/src/database/sql/sql.go
index ad9179cf7d7..6e6f246aeec 100644
--- a/src/database/sql/sql.go
+++ b/src/database/sql/sql.go
@@ -37,6 +37,11 @@ func Register(name string, driver driver.Driver) {
 	drivers[name] = driver
 }
 
+func unregisterAllDrivers() {
+	// For tests.
+	drivers = make(map[string]driver.Driver)
+}
+
 // Drivers returns a sorted list of the names of the registered drivers.
 func Drivers() []string {
 	var list []string