diff --git a/runtime/Go/antlr/v4/statistics.go b/runtime/Go/antlr/v4/statistics.go
index 0b2923f760..8cb5f3ed6f 100644
--- a/runtime/Go/antlr/v4/statistics.go
+++ b/runtime/Go/antlr/v4/statistics.go
@@ -29,7 +29,7 @@ type goRunStats struct {
 	// within this package.
 	//
 	jStats            []*JStatRec
-	jStatsLock        `RWMutex
+	jStatsLock        RWMutex
 	topN              int
 	topNByMax         []*JStatRec
 	topNByUsed        []*JStatRec