diff --git a/opengl/libs/Android.mk b/opengl/libs/Android.mk
index d636d73..5ba6b76 100644
--- a/opengl/libs/Android.mk
+++ b/opengl/libs/Android.mk
@@ -23,6 +23,8 @@
     LOCAL_CFLAGS += -I$(LOCAL_PATH)/../../../../bionic/libc/private
 endif
 
+LOCAL_CFLAGS += -fvisibility=hidden
+
 include $(BUILD_SHARED_LIBRARY)
 
 
@@ -49,4 +51,6 @@
     LOCAL_CFLAGS += -I$(LOCAL_PATH)/../../../../bionic/libc/private
 endif
 
+LOCAL_CFLAGS += -fvisibility=hidden
+
 include $(BUILD_SHARED_LIBRARY)