diff --git a/piker/ui/_style.py b/piker/ui/_style.py
index 7284a9d1..322247ec 100644
--- a/piker/ui/_style.py
+++ b/piker/ui/_style.py
@@ -79,7 +79,7 @@ class DpiAwareFont:
         return self._qfont
 
     @property
-    def px_size(self):
+    def px_size(self) -> int:
         return self._qfont.pixelSize()
 
     def configure_to_dpi(self, screen: Optional[QtGui.QScreen] = None):
diff --git a/piker/ui/order_mode.py b/piker/ui/order_mode.py
index 29efcd0f..a3f01e9f 100644
--- a/piker/ui/order_mode.py
+++ b/piker/ui/order_mode.py
@@ -337,7 +337,7 @@ async def start_order_mode(
             indexes = ohlc['time'] >= time
 
             if any(indexes):
-                return ohlc['index'][indexes[-1]]
+                return ohlc['index'][indexes][-1]
             else:
                 return ohlc['index'][-1]