diff --git a/libs/gui/IGraphicBufferConsumer.cpp b/libs/gui/IGraphicBufferConsumer.cpp
index f6d087d3b..dc917a8b6 100644
--- a/libs/gui/IGraphicBufferConsumer.cpp
+++ b/libs/gui/IGraphicBufferConsumer.cpp
@@ -444,7 +444,7 @@ status_t BnGraphicBufferConsumer::onTransact(
             CHECK_INTERFACE(IGraphicBufferConsumer, data, reply);
             sp<GraphicBuffer> buffer = new GraphicBuffer();
             data.read(*buffer.get());
-            int slot;
+            int slot = -1;
             int result = attachBuffer(&slot, buffer);
             reply->writeInt32(slot);
             reply->writeInt32(result);