diff --git a/src/ast/typed.rs b/src/ast/typed.rs
index fac8eec..9bce7f0 100644
--- a/src/ast/typed.rs
+++ b/src/ast/typed.rs
@@ -17,9 +17,9 @@ impl FromStr for Type {
     type Err = SemanticErrorKind;
 
     fn from_str(s: &str) -> Result<Self, Self::Err> {
-        match s {
-            "I" => Ok(Type::Int),
-            "F" => Ok(Type::Float),
+        match s.to_lowercase().as_str() {
+            "i" => Ok(Type::Int),
+            "f" => Ok(Type::Float),
             _ => Err(SemanticErrorKind::UnknownType(s.to_string())),
         }
     }