diff --git a/api/src/opentrons/protocol_engine/state/state_summary.py b/api/src/opentrons/protocol_engine/state/state_summary.py
index ca3458929dc..91ddcd40c62 100644
--- a/api/src/opentrons/protocol_engine/state/state_summary.py
+++ b/api/src/opentrons/protocol_engine/state/state_summary.py
@@ -29,4 +29,4 @@ class StateSummary(BaseModel):
     startedAt: Optional[datetime]
     completedAt: Optional[datetime]
     liquids: List[Liquid] = Field(default_factory=list)
-    wells: List[LiquidHeightInfo] = Field(default_factor=list)
+    wells: List[LiquidHeightInfo] = Field(default_factory=list)