diff --git a/openlane/config/pdk_compat.py b/openlane/config/pdk_compat.py
index c985de23..fef84b85 100644
--- a/openlane/config/pdk_compat.py
+++ b/openlane/config/pdk_compat.py
@@ -24,9 +24,9 @@ def migrate_old_config(config: Mapping[str, Any]) -> Dict[str, Any]:
     if "SYNTH_DRIVING_CELL_PIN" in new:
         del new["SYNTH_DRIVING_CELL"]
         del new["SYNTH_DRIVING_CELL_PIN"]
-        new["SYNTH_DRIVING_CELL"] = (
-            f"{config['SYNTH_DRIVING_CELL']}/{config['SYNTH_DRIVING_CELL_PIN']}"
-        )
+        new[
+            "SYNTH_DRIVING_CELL"
+        ] = f"{config['SYNTH_DRIVING_CELL']}/{config['SYNTH_DRIVING_CELL_PIN']}"
 
     # 2. Migrate SYNTH_TIE{HI,LO}_CELL
     if "SYNTH_TIEHI_PORT" in new:
@@ -171,9 +171,9 @@ def migrate_old_config(config: Mapping[str, Any]) -> Dict[str, Any]:
 
         del new["KLAYOUT_DRC_TECH_SCRIPT"]
 
-        new["SYNTH_CLK_DRIVING_CELL"] = (
-            f"{config['SYNTH_CLK_DRIVING_CELL']}/{config['SYNTH_DRIVING_CELL_PIN']}"
-        )
+        new[
+            "SYNTH_CLK_DRIVING_CELL"
+        ] = f"{config['SYNTH_CLK_DRIVING_CELL']}/{config['SYNTH_DRIVING_CELL_PIN']}"
 
     # x3. Timing Corners
     lib_sta: Dict[str, List[str]] = {}
@@ -230,7 +230,6 @@ def process_sta(key: str):
         new["DEFAULT_CORNER"] = f"nom_{default_pvt}"
         new["TIMING_VIOLATION_CORNERS"] = ["*tt*"]
         new["LIB"] = lib_sta
-        new["TIMING_VIOLATION_CORNERS"] = ["*tt*"]
 
     # x4. Constraints (sky130/gf180mcu)
     if new["PDK"].startswith("sky130") or new["PDK"].startswith("gf180mcu"):