diff --git a/make-linux.mk b/make-linux.mk
index a571f3446..1280e8955 100644
--- a/make-linux.mk
+++ b/make-linux.mk
@@ -77,7 +77,7 @@ ifeq ($(ZT_QNAP), 1)
 endif
 
 ifeq ($(ZT_SYNOLOGY), 1)
-	CXXFLAGS+=-fPIC
+	override CXXFLAGS+=-fPIC
         override DEFS+=-D__SYNOLOGY__
 endif