diff --git a/src/abstract_tree/value_node.rs b/src/abstract_tree/value_node.rs
index c6b773a..418c049 100644
--- a/src/abstract_tree/value_node.rs
+++ b/src/abstract_tree/value_node.rs
@@ -50,7 +50,17 @@ impl AbstractTree for ValueNode {
         Ok(r#type)
     }
 
-    fn validate(&self, _context: &Context) -> Result<(), ValidationError> {
+    fn validate(&self, context: &Context) -> Result<(), ValidationError> {
+        if let ValueNode::Map(map_assignments) = self {
+            for (_identifier, r#type, expression) in map_assignments {
+                if let Some(expected_type) = r#type {
+                    let actual_type = expression.expected_type(context)?;
+
+                    expected_type.check(&actual_type)?;
+                }
+            }
+        }
+
         Ok(())
     }
 
diff --git a/tests/values.rs b/tests/values.rs
index a0b8698..4c0ca9d 100644
--- a/tests/values.rs
+++ b/tests/values.rs
@@ -126,7 +126,7 @@ fn map_types() {
     map.insert(Identifier::new("foo"), Value::string("bar".to_string()));
 
     assert_eq!(
-        interpret("{ x <int> = 1, foo <str> = 'bar' }"),
+        interpret("{ x : int = 1, foo : str = 'bar' }"),
         Ok(Some(Value::map(map)))
     );
 }
@@ -134,13 +134,13 @@ fn map_types() {
 #[test]
 fn map_type_errors() {
     assert_eq!(
-        interpret("{ foo <bool> = 'bar' }"),
+        interpret("{ foo : bool = 'bar' }"),
         Err(vec![Error::Validation {
             error: ValidationError::TypeCheck(TypeCheckError {
                 actual: Type::String,
                 expected: Type::Boolean
             }),
-            span: (0..0).into()
+            span: (0..22).into()
         }])
     );
 }