diff --git a/opengl/libagl/Android.mk b/opengl/libagl/Android.mk
index 99efe4c..3ce0414 100644
--- a/opengl/libagl/Android.mk
+++ b/opengl/libagl/Android.mk
@@ -33,6 +33,8 @@
 endif
 
 LOCAL_SHARED_LIBRARIES := libcutils libutils libpixelflinger
+LOCAL_CFLAGS += -fvisibility=hidden
+
 LOCAL_LDLIBS := -lpthread -ldl
 LOCAL_MODULE:= libagl