diff --git a/cmd/postgres_exporter/util.go b/cmd/postgres_exporter/util.go
index 3baa6f4be..8907e7c5f 100644
--- a/cmd/postgres_exporter/util.go
+++ b/cmd/postgres_exporter/util.go
@@ -159,7 +159,7 @@ func dbToString(t interface{}) (string, bool) {
 		// Try and convert to string
 		return string(v), true
 	case string:
-		return v, true
+		return strings.ToValidUTF8(v, "�"), true
 	case bool:
 		if v {
 			return "true", true