diff --git a/go/buildutil/tags.go b/go/buildutil/tags.go
index 525ecb6c..486606f3 100644
--- a/go/buildutil/tags.go
+++ b/go/buildutil/tags.go
@@ -8,7 +8,7 @@ const TagsFlagDoc = "a list of `build tags` to consider satisfied during the bui
 	"For more information about build tags, see the description of " +
 	"build constraints in the documentation for the go/build package"
 
-// TagsFlag is an implementation of the flag.Value interface that parses
+// TagsFlag is an implementation of the flag.Value and flag.Getter interfaces that parses
 // a flag value in the same manner as go build's -tags flag and
 // populates a []string slice.
 //
@@ -28,6 +28,8 @@ func (v *TagsFlag) Set(s string) error {
 	return err
 }
 
+func (v *TagsFlag) Get() interface{} { return *v }
+
 func splitQuotedFields(s string) ([]string, error) {
 	// Split fields allowing '' or "" around elements.
 	// Quotes further inside the string do not count.