diff --git a/libgralloc/gpu.cpp b/libgralloc/gpu.cpp
index 2db6274..e7549c6 100644
--- a/libgralloc/gpu.cpp
+++ b/libgralloc/gpu.cpp
@@ -43,6 +43,7 @@ gpu_context_t::gpu_context_t(const private_module_t* module,
     common.module  = const_cast<hw_module_t*>(&module->base.common);
     common.close   = gralloc_close;
     alloc          = gralloc_alloc;
+    allocSize      = gralloc_alloc_size;
     free           = gralloc_free;
 
 }