diff --git a/src/finn/custom_op/fpgadataflow/streamingfifo.py b/src/finn/custom_op/fpgadataflow/streamingfifo.py
index c71e8ffe323b1f2bb459a0f982e63d881a7ae58d..522305327ff7c5f1356aad4fdf6b9e0a942eca72 100644
--- a/src/finn/custom_op/fpgadataflow/streamingfifo.py
+++ b/src/finn/custom_op/fpgadataflow/streamingfifo.py
@@ -72,6 +72,9 @@ class StreamingFIFO(HLSCustomOp):
                 ),
                 # whether depth monitoring is enabled (impl_style=rtl only)
                 "depth_monitor": ("i", False, 0),
+                # the FIFO does not need its own FIFOs
+                "inFIFODepths": ("ints", False, [0]),
+                "outFIFODepths": ("ints", False, [0]),
             }
         )