diff --git a/flow/designs/gf12/ariane133/config.mk b/flow/designs/gf12/ariane133/config.mk
index 712efe145f..d714113da9 100644
--- a/flow/designs/gf12/ariane133/config.mk
+++ b/flow/designs/gf12/ariane133/config.mk
@@ -22,7 +22,7 @@ export IO_CONSTRAINTS     = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/io.tcl
 
 export RTLMP_MIN_CHANNEL_SIZE = 20 20
 
-export PLACE_DENSITY_LB_ADDON = 0.05
+export PLACE_DENSITY_LB_ADDON = 0.20
 
 ifeq ($(USE_FILL),1)
 export DESIGN_TYPE = CELL
diff --git a/flow/designs/gf12/tinyRocket/config.mk b/flow/designs/gf12/tinyRocket/config.mk
index 4561b38681..859dae1493 100644
--- a/flow/designs/gf12/tinyRocket/config.mk
+++ b/flow/designs/gf12/tinyRocket/config.mk
@@ -27,7 +27,7 @@ export ADDITIONAL_GDS = $(PLATFORM_DIR)/gds/gf12_1rf_lg6_w32_all.gds2 \
 
 export CORE_UTILIZATION = 50
 
-export PLACE_DENSITY = 0.20
+export PLACE_DENSITY_LB_ADDON = 0.20
 
 export MACRO_WRAPPERS = $(DESIGN_HOME)/$(PLATFORM)/$(DESIGN_NICKNAME)/wrappers.tcl