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 a0e44e0..44a4c1a 100644
--- a/blueprintcompiler/language/gtk_a11y.py
+++ b/blueprintcompiler/language/gtk_a11y.py
@@ -121,6 +121,10 @@ 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"])
@@ -181,12 +185,13 @@ def a11y_name_completer(ast_node, match_variables):
 
 @decompiler("relation", cdata=True)
 def decompile_relation(ctx, gir, name, cdata):
+    name = name.replace("-", "_")
     ctx.print_attribute(name, cdata, get_types(ctx.gir).get(name))
 
 @decompiler("state", cdata=True)
 def decompile_state(ctx, gir, name, cdata, translatable="false"):
     if decompile.truthy(translatable):
-        ctx.print(f"{name}: _(\"{_escape_quote(cdata)}\");")
+        ctx.print(f"{name.replace('-', '_')}: _(\"{_escape_quote(cdata)}\");")
     else:
         ctx.print_attribute(name, cdata, get_types(ctx.gir).get(name))
 
diff --git a/tests/samples/accessibility.blp b/tests/samples/accessibility.blp
index 117457a..780e940 100644
--- a/tests/samples/accessibility.blp
+++ b/tests/samples/accessibility.blp
@@ -1,6 +1,6 @@
 using Gtk 4.0;
 
-Gtk.Widget {
+Gtk.Box {
   accessibility {
     label: _("Hello, world!");
     labelled_by: my_label;
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..176faf7 100644
--- a/tests/samples/accessibility_dec.blp
+++ b/tests/samples/accessibility_dec.blp
@@ -1,6 +1,6 @@
 using Gtk 4.0;
 
-Widget {
+Box {
   accessibility {
     label: _("Hello, world!");
     labelled_by: my_label;