diff --git a/ref/gl/gl_rsurf.c b/ref/gl/gl_rsurf.c
index fe9caebc..9a6704fd 100644
--- a/ref/gl/gl_rsurf.c
+++ b/ref/gl/gl_rsurf.c
@@ -3532,7 +3532,8 @@ void GL_BuildLightmaps( void )
 	memset( &RI, 0, sizeof( RI ));
 
 	// update the lightmap blocksize
-	if( FBitSet( ENGINE_GET_PARM( PARM_FEATURES ), ENGINE_LARGE_LIGHTMAPS ))
+	if( FBitSet( ENGINE_GET_PARM( PARM_FEATURES ), ENGINE_LARGE_LIGHTMAPS )
+		|| ENGINE_GET_PARM( PARM_WORLD_VERSION ) == QBSP2_VERSION )
 		tr.block_size = BLOCK_SIZE_MAX;
 	else tr.block_size = BLOCK_SIZE_DEFAULT;