diff --git a/src/compiler/ast.rs b/src/compiler/ast.rs
index cd50a55..da7790c 100644
--- a/src/compiler/ast.rs
+++ b/src/compiler/ast.rs
@@ -40,7 +40,7 @@ impl<'source> fmt::Display for AstNode<'source> {
 #[derive(Debug, PartialEq, Clone)]
 pub enum Expression<'source> {
     EmptyLiteral(),
-    IntLiteral(i64),
+    IntLiteral(i128),
     BoolLiteral(bool),
     Identifier(&'source str),
     UnaryOp(&'source str, Box<AstNode<'source>>),
diff --git a/src/compiler/ir_generator.rs b/src/compiler/ir_generator.rs
index 76c8e52..6b900be 100644
--- a/src/compiler/ir_generator.rs
+++ b/src/compiler/ir_generator.rs
@@ -109,7 +109,8 @@ fn visit_ast_node<'source>(
         EmptyLiteral() => add_var(&Type::Unit, types),
         IntLiteral(val) => {
             let var = add_var(&Type::Int, types);
-            instructions.push(IrInstruction::new(ast.loc, LoadIntConst(*val, var.clone())));
+            let val = *val as i64;
+            instructions.push(IrInstruction::new(ast.loc, LoadIntConst(val, var.clone())));
             var
         }
         BoolLiteral(val) => {
diff --git a/src/compiler/parser/mod.rs b/src/compiler/parser/mod.rs
index b616bb6..4077ba1 100644
--- a/src/compiler/parser/mod.rs
+++ b/src/compiler/parser/mod.rs
@@ -275,7 +275,7 @@ fn parse_int_literal<'source>(pos: &mut usize, tokens: &[Token]) -> AstNode<'sou
     let expr = IntLiteral(
         token
             .text
-            .parse::<i64>()
+            .parse::<i128>()
             .unwrap_or_else(|_| panic!("Fatal parser error! Invalid value in token {token}")),
     );
 
diff --git a/src/compiler/variable.rs b/src/compiler/variable.rs
index 2f565f0..979d175 100644
--- a/src/compiler/variable.rs
+++ b/src/compiler/variable.rs
@@ -10,7 +10,7 @@ pub enum Type {
 
 #[derive(PartialEq, PartialOrd, Debug, Copy, Clone)]
 pub enum Value {
-    Int(i64),
+    Int(i128),
     Bool(bool),
     Func(fn(&[Value]) -> Value),
     None(),