diff --git a/crates/concrete_ir/src/lowering.rs b/crates/concrete_ir/src/lowering.rs
index 6cf620e..3528f2a 100644
--- a/crates/concrete_ir/src/lowering.rs
+++ b/crates/concrete_ir/src/lowering.rs
@@ -3,6 +3,7 @@ use std::collections::HashMap;
 use common::{BuildCtx, FnBodyBuilder, IdGenerator};
 use concrete_ast::{
     common::Span,
+    constants::ConstantDef,
     expressions::{
         ArithOp, BinaryOp, BitwiseOp, CmpOp, Expression, FnCallOp, IfExpr, LogicOp, PathOp,
         PathSegment, ValueExpr,
@@ -75,7 +76,9 @@ fn lower_module(mut ctx: BuildCtx, module: &Module, id: DefId) -> Result<BuildCt
     // lower first structs, constants, types
     for content in &module.contents {
         match content {
-            ModuleDefItem::Constant(_) => todo!(),
+            ModuleDefItem::Constant(info) => {
+                ctx = lower_constant(ctx, info, id)?;
+            }
             ModuleDefItem::Struct(info) => {
                 ctx = lower_struct(ctx, info, id)?;
             }
@@ -179,6 +182,14 @@ fn lower_module(mut ctx: BuildCtx, module: &Module, id: DefId) -> Result<BuildCt
     Ok(ctx)
 }
 
+fn lower_constant(
+    mut ctx: BuildCtx,
+    info: &ConstantDef,
+    id: DefId,
+) -> Result<BuildCtx, LoweringError> {
+    todo!()
+}
+
 fn lower_struct(
     mut ctx: BuildCtx,
     info: &StructDecl,