diff --git a/nufxlib/Version.c b/nufxlib/Version.c
index 0951c41..7eec7c2 100644
--- a/nufxlib/Version.c
+++ b/nufxlib/Version.c
@@ -13,7 +13,11 @@ static const char gNuBuildDate[] = __DATE__;
 static const char gNuBuildDate[] = "??? ?? ????";
 #endif
 
+#ifdef OPTFLAGSTR
 static const char gNuBuildFlags[] = OPTFLAGSTR;
+#else
+static const char gNuBuildFlags[] = "-";
+#endif
 
 
 /*