diff --git a/blueprintcompiler/language/values.py b/blueprintcompiler/language/values.py
index 74d06f1..f92ba67 100644
--- a/blueprintcompiler/language/values.py
+++ b/blueprintcompiler/language/values.py
@@ -129,7 +129,7 @@ class IdentValue(Value):
     def validate_for_type(self):
         type = self.parent.value_type
 
-        if isinstance(type, gir.Enumeration):
+        if isinstance(type, gir.Enumeration) or isinstance(type, gir.Bitfield):
             if self.tokens["value"] not in type.members:
                 raise CompileError(
                     f"{self.tokens['value']} is not a member of {type.full_name}",
diff --git a/tests/samples/flags.blp b/tests/samples/flags.blp
index b185a99..aafda40 100644
--- a/tests/samples/flags.blp
+++ b/tests/samples/flags.blp
@@ -4,3 +4,7 @@ using Gio 2.0;
 Gio.Application {
   flags: is_service | handles_open;
 }
+
+EventControllerScroll {
+  flags: vertical;
+}
diff --git a/tests/samples/flags.ui b/tests/samples/flags.ui
index 62441dd..d2bac55 100644
--- a/tests/samples/flags.ui
+++ b/tests/samples/flags.ui
@@ -4,4 +4,7 @@
   <object class="GApplication">
     <property name="flags">is_service|handles_open</property>
   </object>
+  <object class="GtkEventControllerScroll">
+    <property name="flags">vertical</property>
+  </object>
 </interface>