diff --git a/blueprintcompiler/language/attributes.py b/blueprintcompiler/language/attributes.py
index 49707ab..a6db9f1 100644
--- a/blueprintcompiler/language/attributes.py
+++ b/blueprintcompiler/language/attributes.py
@@ -28,9 +28,13 @@ class BaseAttribute(AstNode):
     tag_name: str = ""
     attr_name: str = "name"
 
+    @property
+    def name(self):
+        return self.tokens["name"]
+
     def emit_xml(self, xml: XmlEmitter):
         value = self.children[Value][0]
-        attrs = { self.attr_name: self.tokens["name"] }
+        attrs = { self.attr_name: self.name }
 
         if isinstance(value, TranslatedStringValue):
             attrs = { **attrs, **value.attrs }
diff --git a/blueprintcompiler/language/gtk_a11y.py b/blueprintcompiler/language/gtk_a11y.py
index 51a362c..161c608 100644
--- a/blueprintcompiler/language/gtk_a11y.py
+++ b/blueprintcompiler/language/gtk_a11y.py
@@ -28,23 +28,23 @@ def get_property_types(gir):
     return {
         "autocomplete": gir.get_type("AccessibleAutocomplete", "Gtk"),
         "description": StringType(),
-        "has_popup": BoolType(),
-        "key_shortcuts": StringType(),
+        "has-popup": BoolType(),
+        "key-shortcuts": StringType(),
         "label": StringType(),
         "level": IntType(),
         "modal": BoolType(),
-        "multi_line": BoolType(),
-        "multi_selectable": BoolType(),
+        "multi-line": BoolType(),
+        "multi-selectable": BoolType(),
         "orientation": gir.get_type("Orientation", "Gtk"),
         "placeholder": StringType(),
-        "read_only": BoolType(),
+        "read-only": BoolType(),
         "required": BoolType(),
-        "role_description": StringType(),
+        "role-description": StringType(),
         "sort": gir.get_type("AccessibleSort", "Gtk"),
-        "value_max": FloatType(),
-        "value_min": FloatType(),
-        "value_now": FloatType(),
-        "value_text": StringType(),
+        "value-max": FloatType(),
+        "value-min": FloatType(),
+        "value-now": FloatType(),
+        "value-text": StringType(),
     }
 
 
@@ -52,24 +52,24 @@ def get_relation_types(gir):
     # from <https://docs.gtk.org/gtk4/enum.AccessibleRelation.html>
     widget = gir.get_type("Widget", "Gtk")
     return {
-        "active_descendant": widget,
-        "col_count": IntType(),
-        "col_index": IntType(),
-        "col_index_text": StringType(),
-        "col_span": IntType(),
+        "active-descendant": widget,
+        "col-count": IntType(),
+        "col-index": IntType(),
+        "col-index-text": StringType(),
+        "col-span": IntType(),
         "controls": widget,
-        "described_by": widget,
+        "described-by": widget,
         "details": widget,
-        "error_message": widget,
-        "flow_to": widget,
-        "labelled_by": widget,
+        "error-message": widget,
+        "flow-to": widget,
+        "labelled-by": widget,
         "owns": widget,
-        "pos_in_set": IntType(),
-        "row_count": IntType(),
-        "row_index": IntType(),
-        "row_index_text": StringType(),
-        "row_span": IntType(),
-        "set_size": IntType(),
+        "pos-in-set": IntType(),
+        "row-count": IntType(),
+        "row-index": IntType(),
+        "row-index-text": StringType(),
+        "row-span": IntType(),
+        "set-size": IntType(),
     }
 
 
@@ -122,6 +122,10 @@ class A11yProperty(BaseTypedAttribute):
         else:
             raise CompilerBugError()
 
+    @property
+    def name(self):
+        return self.tokens["name"].replace("_", "-")
+
     @property
     def value_type(self) -> GirType:
         return get_types(self.root.gir).get(self.tokens["name"])
diff --git a/docs/examples.rst b/docs/examples.rst
index e53da1c..bf28784 100644
--- a/docs/examples.rst
+++ b/docs/examples.rst
@@ -332,7 +332,7 @@ Basic Usage
    Gtk.Widget {
      accessibility {
        orientation: vertical;
-       labelled_by: my_label;
+       labelled-by: my_label;
        checked: true;
      }
    }
diff --git a/tests/sample_errors/a11y_prop_obj_dne.blp b/tests/sample_errors/a11y_prop_obj_dne.blp
index 96074fa..e0285ff 100644
--- a/tests/sample_errors/a11y_prop_obj_dne.blp
+++ b/tests/sample_errors/a11y_prop_obj_dne.blp
@@ -2,6 +2,6 @@ using Gtk 4.0;
 
 Widget {
   accessibility {
-    labelled_by: not_an_object;
+    labelled-by: not_an_object;
   }
 }
diff --git a/tests/samples/accessibility.blp b/tests/samples/accessibility.blp
index 117457a..ec563b4 100644
--- a/tests/samples/accessibility.blp
+++ b/tests/samples/accessibility.blp
@@ -1,9 +1,9 @@
 using Gtk 4.0;
 
-Gtk.Widget {
+Gtk.Box {
   accessibility {
     label: _("Hello, world!");
-    labelled_by: my_label;
+    labelled-by: my_label;
     checked: true;
   }
 }
diff --git a/tests/samples/accessibility.ui b/tests/samples/accessibility.ui
index 718e24f..50e98c8 100644
--- a/tests/samples/accessibility.ui
+++ b/tests/samples/accessibility.ui
@@ -1,10 +1,10 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <interface>
   <requires lib="gtk" version="4.0"/>
-  <object class="GtkWidget">
+  <object class="GtkBox">
     <accessibility>
       <property name="label" translatable="true">Hello, world!</property>
-      <relation name="labelled_by">my_label</relation>
+      <relation name="labelled-by">my_label</relation>
       <state name="checked">true</state>
     </accessibility>
   </object>
diff --git a/tests/samples/accessibility_dec.blp b/tests/samples/accessibility_dec.blp
index 9daacb4..a603e25 100644
--- a/tests/samples/accessibility_dec.blp
+++ b/tests/samples/accessibility_dec.blp
@@ -1,9 +1,9 @@
 using Gtk 4.0;
 
-Widget {
+Box {
   accessibility {
     label: _("Hello, world!");
-    labelled_by: my_label;
+    labelled-by: my_label;
     checked: true;
   }
 }