diff --git a/plugins/GSdx/boost_spsc_queue.hpp b/plugins/GSdx/boost_spsc_queue.hpp
index eb8158598c..cd91249ed7 100644
--- a/plugins/GSdx/boost_spsc_queue.hpp
+++ b/plugins/GSdx/boost_spsc_queue.hpp
@@ -57,6 +57,7 @@ class ringbuffer_base
     atomic<size_t> write_index_;
     char padding1[padding_size]; /* force read_index and write_index to different cache lines */
     atomic<size_t> read_index_;
+    char padding2[padding_size]; /* force read_index and pending_pop_read_index to different cache lines */
 
     size_t pending_pop_read_index;