diff --git a/drivers/staging/android/ion/ion.h b/drivers/staging/android/ion/ion.h
index 5cd978cfc9fa..6bd962c3e7bb 100644
--- a/drivers/staging/android/ion/ion.h
+++ b/drivers/staging/android/ion/ion.h
@@ -315,7 +315,12 @@ struct ion_page_pool *ion_page_pool_create(gfp_t gfp_mask, unsigned int order);
 void ion_page_pool_destroy(struct ion_page_pool *pool);
 struct page *ion_page_pool_alloc(struct ion_page_pool *pool);
 void ion_page_pool_free(struct ion_page_pool *pool, struct page *page);
+
+#ifdef CONFIG_ION_SYSTEM_HEAP
 long ion_page_pool_nr_pages(void);
+#else
+static inline long ion_page_pool_nr_pages(void) { return 0; }
+#endif
 
 /** ion_page_pool_shrink - shrinks the size of the memory cached in the pool
  * @pool:		the pool