diff --git a/sky130/librelane/sky130_fd_sc_hd/config.tcl b/sky130/librelane/sky130_fd_sc_hd/config.tcl
index 6954ed1..d3bf7d4 100755
--- a/sky130/librelane/sky130_fd_sc_hd/config.tcl
+++ b/sky130/librelane/sky130_fd_sc_hd/config.tcl
@@ -18,7 +18,7 @@
 # defaults (can be overridden by designs):
 set ::env(SYNTH_DRIVING_CELL) "$::env(STD_CELL_LIBRARY)__inv_2/Y"
 #capacitance : 0.017653;
-#set ::env(SYNTH_CLK_DRIVING_CELL) "$::env(STD_CELL_LIBRARY)__clkinv_2/Y"
+set ::env(SYNTH_CLK_DRIVING_CELL) "$::env(STD_CELL_LIBRARY)__clkinv_2/Y"
 # update these
 set ::env(OUTPUT_CAP_LOAD) "33.442" ; # femtofarad __inv_16 pin A cap (https://github.com/google/skywater-pdk-libs-sky130_fd_sc_hd/blob/main/cells/inv/sky130_fd_sc_hd__inv_16__tt_025C_1v80.lib.json)
 set ::env(SYNTH_BUFFER_CELL) "$::env(STD_CELL_LIBRARY)__buf_2/A/X"
diff --git a/sky130/librelane/sky130_fd_sc_hdll/config.tcl b/sky130/librelane/sky130_fd_sc_hdll/config.tcl
index 94d6a69..20ecdbe 100755
--- a/sky130/librelane/sky130_fd_sc_hdll/config.tcl
+++ b/sky130/librelane/sky130_fd_sc_hdll/config.tcl
@@ -15,7 +15,7 @@
 # defaults (can be overridden by designs):
 set ::env(SYNTH_DRIVING_CELL) "$::env(STD_CELL_LIBRARY)__inv_2/Y"
 #capacitance : 0.017653;
-#set ::env(SYNTH_CLK_DRIVING_CELL) "$::env(STD_CELL_LIBRARY)__clkinv_2/Y"
+set ::env(SYNTH_CLK_DRIVING_CELL) "$::env(STD_CELL_LIBRARY)__clkinv_2/Y"
 # update these
 set ::env(OUTPUT_CAP_LOAD) "33.468" ; # femtofarad _inv_16 pin A cap (https://github.com/google/skywater-pdk-libs-sky130_fd_sc_hdll/blob/main/cells/inv/sky130_fd_sc_hdll__inv_16__tt_025C_1v80.lib.json)
 set ::env(SYNTH_BUFFER_CELL) "$::env(STD_CELL_LIBRARY)__buf_2/A/X"
diff --git a/sky130/librelane/sky130_fd_sc_hs/config.tcl b/sky130/librelane/sky130_fd_sc_hs/config.tcl
index f4df1cd..44759d3 100755
--- a/sky130/librelane/sky130_fd_sc_hs/config.tcl
+++ b/sky130/librelane/sky130_fd_sc_hs/config.tcl
@@ -18,7 +18,7 @@
 # defaults (can be overridden by designs):
 set ::env(SYNTH_DRIVING_CELL) "$::env(STD_CELL_LIBRARY)__inv_2/Y"
 #capacitance : 0.02104;
-#set ::env(SYNTH_CLK_DRIVING_CELL) "$::env(STD_CELL_LIBRARY)__clkinv_2/Y"
+set ::env(SYNTH_CLK_DRIVING_CELL) "$::env(STD_CELL_LIBRARY)__clkinv_2/Y"
 # update these
 set ::env(OUTPUT_CAP_LOAD) "43.39" ; # femtofarad _inv_16 pin A cap (https://github.com/google/skywater-pdk-libs-sky130_fd_sc_hs/blob/main/cells/inv/sky130_fd_sc_hs__inv_16__tt_025C_1v68.lib.json)
 set ::env(SYNTH_BUFFER_CELL) "$::env(STD_CELL_LIBRARY)__buf_2/A/X"
diff --git a/sky130/librelane/sky130_fd_sc_ls/config.tcl b/sky130/librelane/sky130_fd_sc_ls/config.tcl
index 8a9036e..6ba1ca8 100755
--- a/sky130/librelane/sky130_fd_sc_ls/config.tcl
+++ b/sky130/librelane/sky130_fd_sc_ls/config.tcl
@@ -18,7 +18,7 @@
 # defaults (can be overridden by designs):
 set ::env(SYNTH_DRIVING_CELL) "$::env(STD_CELL_LIBRARY)__inv_2/Y"
 #capacitance : 0.017653;
-#set ::env(SYNTH_CLK_DRIVING_CELL) "$::env(STD_CELL_LIBRARY)__clkinv_2/Y"
+set ::env(SYNTH_CLK_DRIVING_CELL) "$::env(STD_CELL_LIBRARY)__clkinv_2/Y"
 # update these
 set ::env(OUTPUT_CAP_LOAD) "46.690" ; # femtofarad _inv_16 pin A cap (https://github.com/google/skywater-pdk-libs-sky130_fd_sc_ls/blob/main/cells/inv/sky130_fd_sc_ls__inv_16__tt_100C_1v80.lib.json)
 set ::env(SYNTH_BUFFER_CELL) "$::env(STD_CELL_LIBRARY)__buf_2/A/X"
diff --git a/sky130/librelane/sky130_fd_sc_ms/config.tcl b/sky130/librelane/sky130_fd_sc_ms/config.tcl
index c8abca4..4aa9916 100755
--- a/sky130/librelane/sky130_fd_sc_ms/config.tcl
+++ b/sky130/librelane/sky130_fd_sc_ms/config.tcl
@@ -18,7 +18,7 @@
 # defaults (can be overridden by designs):
 set ::env(SYNTH_DRIVING_CELL) "$::env(STD_CELL_LIBRARY)__inv_2/Y"
 #capacitance : 0.017653;
-#set ::env(SYNTH_CLK_DRIVING_CELL) "$::env(STD_CELL_LIBRARY)__clkinv_2/Y"
+set ::env(SYNTH_CLK_DRIVING_CELL) "$::env(STD_CELL_LIBRARY)__clkinv_2/Y"
 # update these
 set ::env(OUTPUT_CAP_LOAD) "22.66" ; # femtofarad _inv_8 pin A cap
 set ::env(SYNTH_BUFFER_CELL) "$::env(STD_CELL_LIBRARY)__buf_2/A/X"