diff --git a/parser/src/ast.rs b/parser/src/ast.rs
index fabb675..8ba217a 100644
--- a/parser/src/ast.rs
+++ b/parser/src/ast.rs
@@ -14,6 +14,7 @@ pub struct Block(pub Vec<Statement>);
 #[derive(Debug, Clone, Serialize)]
 pub enum TypePostfix {
     Ref,
+    RefMut,
 }
 
 #[derive(Debug, Clone, Serialize)]
diff --git a/parser/src/grammar.pest b/parser/src/grammar.pest
index 035791b..e60b11b 100644
--- a/parser/src/grammar.pest
+++ b/parser/src/grammar.pest
@@ -75,7 +75,7 @@ while_stmt = {
 // ================= EXPRESSIONS =================
 tuple_type = { "(" ~ (type_expr ~ ("," ~ type_expr)*)? ~ ")" }
 path_type  = { static_path ~ ("<" ~ (type_expr ~ ("," ~ type_expr)*)? ~ ">")? }
-ref_type   = { "*" }
+ref_type   = { mutable? ~ "*" }
 type_expr  = { (path_type | tuple_type) ~ ref_type* }
 
 primary = {
diff --git a/parser/src/lib.rs b/parser/src/lib.rs
index aa07769..584c832 100644
--- a/parser/src/lib.rs
+++ b/parser/src/lib.rs
@@ -44,9 +44,13 @@ impl From<pest::iterators::Pair<'_, Rule>> for TypeExpr {
 impl From<pest::iterators::Pair<'_, Rule>> for TypePostfix {
     fn from(pair: pest::iterators::Pair<'_, Rule>) -> Self {
         match pair.as_rule() {
-            Rule::ref_type => match pair.as_str().trim() {
-                _ => Self::Ref,
-            },
+            Rule::ref_type => {
+                if pair.into_inner().peek().is_some() {
+                    TypePostfix::RefMut
+                } else {
+                    TypePostfix::Ref
+                }
+            }
             _ => unimplemented!("{pair:#?}"),
         }
     }
diff --git a/src/codegen.rs b/src/codegen.rs
index 63bbdf1..0830a5f 100644
--- a/src/codegen.rs
+++ b/src/codegen.rs
@@ -345,6 +345,7 @@ impl GetRust for TypePostfix {
     fn get_rust(&self) -> String {
         match self {
             TypePostfix::Ref => format!("&"),
+            TypePostfix::RefMut => format!("&mut "),
         }
     }
 }