diff --git a/write-fonts/src/tables/gvar.rs b/write-fonts/src/tables/gvar.rs
index f4240e6e5..c204d3239 100644
--- a/write-fonts/src/tables/gvar.rs
+++ b/write-fonts/src/tables/gvar.rs
@@ -10,6 +10,8 @@ use super::variations::{
     PackedDeltas, PackedPointNumbers, Tuple, TupleVariationCount, TupleVariationHeader,
 };
 
+pub mod iup;
+
 /// Variation data for a single glyph, before it is compiled
 #[derive(Clone, Debug)]
 pub struct GlyphVariations {
diff --git a/write-fonts/src/tables/variations/iup.rs b/write-fonts/src/tables/gvar/iup.rs
similarity index 100%
rename from write-fonts/src/tables/variations/iup.rs
rename to write-fonts/src/tables/gvar/iup.rs
diff --git a/write-fonts/src/tables/variations.rs b/write-fonts/src/tables/variations.rs
index 709b1619b..70f1bf8e6 100644
--- a/write-fonts/src/tables/variations.rs
+++ b/write-fonts/src/tables/variations.rs
@@ -4,10 +4,6 @@ include!("../../generated/generated_variations.rs");
 
 pub use read_fonts::tables::variations::{TupleIndex, TupleVariationCount};
 
-mod iup;
-
-pub use iup::{iup_delta_optimize, IupError};
-
 impl TupleVariationHeader {
     pub fn new(
         variation_data_size: u16,