diff --git a/func/func.v b/func/func.v
index 537281c1a..d2de8a1e9 100644
--- a/func/func.v
+++ b/func/func.v
@@ -13,6 +13,7 @@ pub type VectorValuedFn = fn (x f64, y []f64, params []f64) f64
 
 // Definition of an arbitrary function with parameters
 pub struct Fn {
+pub:
 	f ArbitraryFn @[required]
 mut:
 	params []f64