diff --git a/indra/llrender/llgl.cpp b/indra/llrender/llgl.cpp
index 27d8056ea2..0b56b3889c 100644
--- a/indra/llrender/llgl.cpp
+++ b/indra/llrender/llgl.cpp
@@ -188,6 +188,9 @@ PFNGLWAITSYNCPROC				glWaitSync = NULL;
 PFNGLGETINTEGER64VPROC			glGetInteger64v = NULL;
 PFNGLGETSYNCIVPROC				glGetSynciv = NULL;
 
+// GL_APPLE_flush_buffer_range
+PFNGLBUFFERPARAMETERIAPPLEPROC	glBufferParameteriAPPLE = NULL;
+PFNGLFLUSHMAPPEDBUFFERRANGEAPPLEPROC glFlushMappedBufferRangeAPPLE = NULL;
 
 // vertex object prototypes
 PFNGLNEWOBJECTBUFFERATIPROC			glNewObjectBufferATI = NULL;