diff --git a/scripts/metricsgen/metricsgen.go b/scripts/metricsgen/metricsgen.go
index a63fdeb99..4b122f975 100644
--- a/scripts/metricsgen/metricsgen.go
+++ b/scripts/metricsgen/metricsgen.go
@@ -144,14 +144,14 @@ func main() {
 		log.Fatalf("Generating code: %v", err)
 	}
 }
+func ignoreTestFiles(f fs.FileInfo) bool {
+	return !strings.Contains(f.Name(), "_test.go")
+}
 
 // ParseMetricsDir parses the dir and scans for a struct matching structName,
 // ignoring all test files. ParseMetricsDir iterates the fields of the metrics
 // struct and builds a TemplateData using the data obtained from the abstract syntax tree.
 func ParseMetricsDir(dir string, structName string) (TemplateData, error) {
-	ignoreTestFiles := func(f fs.FileInfo) bool {
-		return !strings.Contains(f.Name(), "_test.go")
-	}
 	fs := token.NewFileSet()
 	d, err := parser.ParseDir(fs, dir, ignoreTestFiles, parser.ParseComments)
 	if err != nil {