diff --git a/main.go b/main.go
index 0c50cc0..d804f01 100644
--- a/main.go
+++ b/main.go
@@ -205,8 +205,17 @@ func main() {
 		}
 	}
 
+	filesToGenerate := map[string]struct{}{}
+	for _, file := range g.Request.FileToGenerate {
+		filesToGenerate[file] = struct{}{}
+	}
+
 	// Generate the encoders
 	for _, file := range g.Request.GetProtoFile() {
+		// Ignore files not in g.Request.FileToGenerate.
+		if _, ok := filesToGenerate[*file.Name]; !ok {
+			continue
+		}
 		if all {
 			if singlePackageMode {
 				if _, err = registry.LookupFile(file.GetName()); err != nil {