diff --git a/blueprintcompiler/language/gtkbuilder_template.py b/blueprintcompiler/language/gtkbuilder_template.py
index 92dff71..0de7381 100644
--- a/blueprintcompiler/language/gtkbuilder_template.py
+++ b/blueprintcompiler/language/gtkbuilder_template.py
@@ -37,6 +37,10 @@ class Template(Object):
     def not_abstract(self):
         pass # does not apply to templates
 
+    @validate("name")
+    def unique_in_parent(self):
+        self.validate_unique_in_parent(f"Only one template may be defined per file, but this file contains {len(self.parent.children[Template])}",)
+
     def emit_xml(self, xml: XmlEmitter):
         xml.start_tag(
             "template",
diff --git a/blueprintcompiler/language/ui.py b/blueprintcompiler/language/ui.py
index a41e585..9123bf8 100644
--- a/blueprintcompiler/language/ui.py
+++ b/blueprintcompiler/language/ui.py
@@ -71,16 +71,6 @@ class UI(AstNode):
             raise MultipleErrors(self._gir_errors)
 
 
-    @validate()
-    def at_most_one_template(self):
-        if len(self.children[Template]) > 1:
-            for template in self.children[Template][1:]:
-                raise CompileError(
-                    f"Only one template may be defined per file, but this file contains {len(self.children[Template])}",
-                    template.group.tokens["name"].start, template.group.tokens["name"].end,
-                )
-
-
     @validate()
     def unique_ids(self):
         passed = {}