diff --git a/src/ophyd_async/core/detector.py b/src/ophyd_async/core/detector.py
index 700a7cdabe..9badaa16ad 100644
--- a/src/ophyd_async/core/detector.py
+++ b/src/ophyd_async/core/detector.py
@@ -240,7 +240,7 @@ async def read(self) -> Dict[str, Reading]:
         # All data is in StreamResources, not Events, so nothing to output here
         return {}
 
-    def describe(self) -> Dict[str, Descriptor]:
+    async def describe(self) -> Dict[str, Descriptor]:
         return self._describe
 
     @AsyncStatus.wrap