diff --git a/basis/math/vectors/vectors.factor b/basis/math/vectors/vectors.factor
index bad2733bbf..0fe1404516 100644
--- a/basis/math/vectors/vectors.factor
+++ b/basis/math/vectors/vectors.factor
@@ -58,6 +58,10 @@ IN: math.vectors
 : vnlerp ( a b t -- a_t )
     [ lerp ] curry 2map ;
 
+: vbilerp ( aa ba ab bb {t,u} -- a_tu )
+    [ first vnlerp ] [ second vnlerp ] bi-curry
+    [ 2bi@ ] [ call ] bi* ;
+
 HINTS: vneg { array } ;
 HINTS: norm-sq { array } ;
 HINTS: norm { array } ;