diff --git a/plugins/GSdx/Renderers/OpenGL/GSTextureOGL.cpp b/plugins/GSdx/Renderers/OpenGL/GSTextureOGL.cpp
index f0e871f0f3..60f500a951 100644
--- a/plugins/GSdx/Renderers/OpenGL/GSTextureOGL.cpp
+++ b/plugins/GSdx/Renderers/OpenGL/GSTextureOGL.cpp
@@ -121,6 +121,11 @@ namespace PboPool {
 			// Align current transfer on the start of the segment
 			m_offset = m_seg_size * segment_next;
 
+			if (m_size > m_seg_size) {
+				fprintf(stderr, "BUG: PBO Map size %u is bigger than a single segment %u. Crossing more than one fence is not supported yet, texture data may be corrupted.\n", m_size, m_seg_size);
+				// TODO Synchronize all crossed fences
+			}
+
 			// protect the left segment
 			m_fence[segment_current] = glFenceSync(GL_SYNC_GPU_COMMANDS_COMPLETE, 0);