diff --git a/layout/forms/nsComboboxControlFrame.cpp b/layout/forms/nsComboboxControlFrame.cpp
index 8c59adf4ce89..ba6fb9ecb2bb 100644
--- a/layout/forms/nsComboboxControlFrame.cpp
+++ b/layout/forms/nsComboboxControlFrame.cpp
@@ -1285,8 +1285,8 @@ nsComboboxDisplayFrame::Reflow(nsPresContext*           aPresContext,
     computedWidth = 0;
   }
   state.SetComputedWidth(computedWidth);
-
-  return nsBlockFrame::Reflow(aPresContext, aDesiredSize, state, aStatus);
+  nsBlockFrame::Reflow(aPresContext, aDesiredSize, state, aStatus);
+  aStatus = NS_FRAME_COMPLETE; // this type of frame can't be split
 }
 
 void