diff --git a/internal/common/tools/tools.go b/internal/common/tools/tools.go
index a37783ae..05a36943 100644
--- a/internal/common/tools/tools.go
+++ b/internal/common/tools/tools.go
@@ -83,7 +83,7 @@ func gnbIdGenerator(i int, gnbId string) string {
 	}
 	base := int(gnbId_int) + i
 
-	gnbId = fmt.Sprintf("%06x", base)
+	gnbId = fmt.Sprintf("%06X", base)
 	return gnbId
 }