diff --git a/project/extras.mk b/project/extras.mk
index 03b5c36..3a89ca3 100644
--- a/project/extras.mk
+++ b/project/extras.mk
@@ -1,5 +1,5 @@
 CFLAGS_SHARED_ATTR 	+= -DNTCON_EXPORT
-CFLAGS_STATIC_ATTR 	+= -DNTCON_STATIC
+CFLAGS_STATIC_ATTR 	+= -DNTCON_STATIC -fvisibility=hidden
 
 CFLAGS_CONFIG 		+= -D_MIDIPIX_FREESTANDING -D__NT$(HOST_BITS)
 CFLAGS_CONFIG 		+= -UWIN32 -U_WIN32 -U__WIN32 -U__WIN32__