diff --git a/lib_jl.asy b/lib_jl.asy
index 8b205b5..4e1faed 100644
--- a/lib_jl.asy
+++ b/lib_jl.asy
@@ -4,6 +4,7 @@ usepackage("icomma");
 usepackage("esvect");
 usepackage("mathrsfs");
 
+import math;
 import graph_pi;
 import graph3;
 import gm_probabilitytree;