diff --git a/meson.build b/meson.build
index bf2e2b6..2c3123c 100755
--- a/meson.build
+++ b/meson.build
@@ -48,7 +48,7 @@ if compiler.get_id() == 'gcc'
 endif
 
 # some improvements
-cflags += ['-fno-plt', '-flto']
+cflags += ['-fno-plt', '-flto', '-isystem', '-fvisibility=hidden', '-DVALA_EXTERN=extern']
 
 libc_srcs = []