diff --git a/indra/llrender/llgl.h b/indra/llrender/llgl.h
--- a/indra/llrender/llgl.h
+++ b/indra/llrender/llgl.h
@@ -427,6 +427,7 @@
 	virtual void placeFence() = 0;
 	virtual bool isCompleted() = 0;
 	virtual void wait() = 0;
+	virtual ~LLGLFence(){} //fixes potential memory leak!! base class should have a virtual destroyer.
 };
 
 class LLGLSyncFence : public LLGLFence