diff --git a/language/proto/fileinfo.go b/language/proto/fileinfo.go
index 2388f29c8..594fb0b02 100644
--- a/language/proto/fileinfo.go
+++ b/language/proto/fileinfo.go
@@ -50,7 +50,7 @@ type Option struct {
 
 var protoRe = buildProtoRegexp()
 
-func protoFileInfo(dir, name string) FileInfo {
+func ProtoFileInfo(dir, name string) FileInfo {
 	info := FileInfo{
 		Path: filepath.Join(dir, name),
 		Name: name,
diff --git a/language/proto/fileinfo_test.go b/language/proto/fileinfo_test.go
index 0d2c893cf..ea1f3e4b6 100644
--- a/language/proto/fileinfo_test.go
+++ b/language/proto/fileinfo_test.go
@@ -233,7 +233,7 @@ import "second.proto";`,
 				t.Fatal(err)
 			}
 
-			got := protoFileInfo(dir, tc.name)
+			got := ProtoFileInfo(dir, tc.name)
 
 			// Clear fields we don't care about for testing.
 			got = FileInfo{
diff --git a/language/proto/generate.go b/language/proto/generate.go
index 725597e38..19641fb0e 100644
--- a/language/proto/generate.go
+++ b/language/proto/generate.go
@@ -119,7 +119,7 @@ func RuleName(names ...string) string {
 func buildPackages(pc *ProtoConfig, dir, rel string, protoFiles, genFiles []string) []*Package {
 	packageMap := make(map[string]*Package)
 	for _, name := range protoFiles {
-		info := protoFileInfo(dir, name)
+		info := ProtoFileInfo(dir, name)
 		key := info.PackageName
 
 		if pc.Mode == FileMode {