diff --git a/project/extras.mk b/project/extras.mk
index bb6cd7f..a24ae15 100644
--- a/project/extras.mk
+++ b/project/extras.mk
@@ -1,5 +1,5 @@
-CFLAGS_SHARED_ATTR 	+= -DDALIST_EXPORT
-CFLAGS_STATIC_ATTR 	+= -DDALIST_STATIC
+CFLAGS_SHARED_ATTR 	+= -DDALIST_EXPORT -fvisibility=hidden
+CFLAGS_STATIC_ATTR 	+= -DDALIST_STATIC -fvisibility=hidden
 
 ifeq ($(CC_BINFMT),PE)
 	CFLAGS_CONFIG 	+= -D_MIDIPIX_FREESTANDING -D__NT$(HOST_BITS)