diff --git a/sky130/openlane/sky130_fd_sc_hd/config.tcl b/sky130/openlane/sky130_fd_sc_hd/config.tcl
index db8bd12..7cc22df 100755
--- a/sky130/openlane/sky130_fd_sc_hd/config.tcl
+++ b/sky130/openlane/sky130_fd_sc_hd/config.tcl
@@ -64,7 +64,7 @@
 set ::env(CLK_BUFFER) sky130_fd_sc_hd__clkbuf_4
 set ::env(CLK_BUFFER_INPUT) A
 set ::env(CLK_BUFFER_OUTPUT) X
-set ::env(CTS_CLK_BUFFER_LIST) "sky130_fd_sc_hd__clkbuf_1 sky130_fd_sc_hd__clkbuf_2 sky130_fd_sc_hd__clkbuf_4 sky130_fd_sc_hd__clkbuf_8"
+set ::env(CTS_CLK_BUFFER_LIST) "sky130_fd_sc_hd__clkbuf_2 sky130_fd_sc_hd__clkbuf_4 sky130_fd_sc_hd__clkbuf_8"
 set ::env(FP_PDN_RAIL_WIDTH) 0.48
 # Determined from https://github.com/google/skywater-pdk-libs-sky130_fd_sc_hd/blob/ac7fb61f06e6470b94e8afdf7c25268f62fbd7b1/cells/clkbuf/sky130_fd_sc_hd__clkbuf_16__tt_025C_1v80.lib.json
 set ::env(CTS_MAX_CAP) 1.53169
diff --git a/sky130/openlane/sky130_fd_sc_hdll/config.tcl b/sky130/openlane/sky130_fd_sc_hdll/config.tcl
index 200d22b..73c6b89 100755
--- a/sky130/openlane/sky130_fd_sc_hdll/config.tcl
+++ b/sky130/openlane/sky130_fd_sc_hdll/config.tcl
@@ -61,7 +61,7 @@
 set ::env(CLK_BUFFER) $::env(STD_CELL_LIBRARY)__clkbuf_4
 set ::env(CLK_BUFFER_INPUT) A
 set ::env(CLK_BUFFER_OUTPUT) X
-set ::env(CTS_CLK_BUFFER_LIST) "sky130_fd_sc_hdll__clkbuf_1 sky130_fd_sc_hdll__clkbuf_2 sky130_fd_sc_hdll__clkbuf_4 sky130_fd_sc_hdll__clkbuf_8"
+set ::env(CTS_CLK_BUFFER_LIST) "sky130_fd_sc_hdll__clkbuf_2 sky130_fd_sc_hdll__clkbuf_4 sky130_fd_sc_hdll__clkbuf_8"
 set ::env(FP_PDN_RAIL_WIDTH) 0.48
 # Determined from https://github.com/google/skywater-pdk-libs-sky130_fd_sc_hdll/blob/0694bd23893de20f5233ef024acf6cca1e750ac6/cells/clkbuf/sky130_fd_sc_hdll__clkbuf_16__tt_025C_1v80.lib.json
 set ::env(CTS_MAX_CAP) 1.03547
diff --git a/sky130/openlane/sky130_fd_sc_hvl/config.tcl b/sky130/openlane/sky130_fd_sc_hvl/config.tcl
index 287aefb..ef7ff50 100644
--- a/sky130/openlane/sky130_fd_sc_hvl/config.tcl
+++ b/sky130/openlane/sky130_fd_sc_hvl/config.tcl
@@ -69,7 +69,7 @@
 set ::env(CLK_BUFFER) sky130_fd_sc_hvl__buf_4
 set ::env(CLK_BUFFER_INPUT) A
 set ::env(CLK_BUFFER_OUTPUT) X
-set ::env(CTS_CLK_BUFFER_LIST) "sky130_fd_sc_hvl__buf_1 sky130_fd_sc_hvl__buf_2 sky130_fd_sc_hvl__buf_4 sky130_fd_sc_hvl__buf_8"
+set ::env(CTS_CLK_BUFFER_LIST) "sky130_fd_sc_hvl__buf_2 sky130_fd_sc_hvl__buf_4 sky130_fd_sc_hvl__buf_8"
 set ::env(CTS_MAX_CAP) 5.57100
 set ::env(DEFAULT_MAX_TRAN) 0.75
 set ::env(FP_PDN_RAIL_WIDTH) 0.51
diff --git a/sky130/openlane/sky130_fd_sc_ls/config.tcl b/sky130/openlane/sky130_fd_sc_ls/config.tcl
index 86e4fd4..81477fb 100755
--- a/sky130/openlane/sky130_fd_sc_ls/config.tcl
+++ b/sky130/openlane/sky130_fd_sc_ls/config.tcl
@@ -64,7 +64,7 @@
 set ::env(CLK_BUFFER) $::env(STD_CELL_LIBRARY)__clkbuf_4
 set ::env(CLK_BUFFER_INPUT) A
 set ::env(CLK_BUFFER_OUTPUT) X
-set ::env(CTS_CLK_BUFFER_LIST) "sky130_fd_sc_ls__clkbuf_1 sky130_fd_sc_ls__clkbuf_2 sky130_fd_sc_ls__clkbuf_4 sky130_fd_sc_ls__clkbuf_8"
+set ::env(CTS_CLK_BUFFER_LIST) "sky130_fd_sc_ls__clkbuf_2 sky130_fd_sc_ls__clkbuf_4 sky130_fd_sc_ls__clkbuf_8"
 set ::env(CTS_MAX_CAP) 1.53169
 set ::env(DEFAULT_MAX_TRAN) 0.75
 set ::env(FP_PDN_RAIL_WIDTH) 0.48