diff --git a/app/android.go b/app/android.go
index a0c3312..491af51 100644
--- a/app/android.go
+++ b/app/android.go
@@ -35,8 +35,9 @@
 #include <pthread.h>
 #include <stdlib.h>
 
-EGLDisplay display;
-EGLSurface surface;
+extern EGLDisplay display;
+extern EGLSurface surface;
+
 
 char* createEGLSurface(ANativeWindow* window);
 char* destroyEGLSurface();