diff --git a/sky130/librelane/sky130_fd_sc_hd/config.tcl b/sky130/librelane/sky130_fd_sc_hd/config.tcl
index d3bf7d4..1a954da 100755
--- a/sky130/librelane/sky130_fd_sc_hd/config.tcl
+++ b/sky130/librelane/sky130_fd_sc_hd/config.tcl
@@ -48,4 +48,4 @@
 
 set ::env(PDN_RAIL_WIDTH) 0.48
 
-set ::env(TRISTATE_CELLS) "$::env(STD_CELL_LIBRARY)__ebuf*"
+set ::env(TRISTATE_CELLS) "$::env(STD_CELL_LIBRARY)__ebuf* $::env(STD_CELL_LIBRARY)__einv*"
diff --git a/sky130/librelane/sky130_fd_sc_hdll/config.tcl b/sky130/librelane/sky130_fd_sc_hdll/config.tcl
index 20ecdbe..ec1de77 100755
--- a/sky130/librelane/sky130_fd_sc_hdll/config.tcl
+++ b/sky130/librelane/sky130_fd_sc_hdll/config.tcl
@@ -45,4 +45,4 @@
 
 set ::env(PDN_RAIL_WIDTH) 0.48
 
-set ::env(TRISTATE_CELLS) "$::env(STD_CELL_LIBRARY)__ebuf*"
+set ::env(TRISTATE_CELLS) "$::env(STD_CELL_LIBRARY)__ebuf* $::env(STD_CELL_LIBRARY)__einv*"
diff --git a/sky130/librelane/sky130_fd_sc_hs/config.tcl b/sky130/librelane/sky130_fd_sc_hs/config.tcl
index 44759d3..7b4f16e 100755
--- a/sky130/librelane/sky130_fd_sc_hs/config.tcl
+++ b/sky130/librelane/sky130_fd_sc_hs/config.tcl
@@ -48,4 +48,4 @@
 
 set ::env(PDN_RAIL_WIDTH) 0.48
 
-set ::env(TRISTATE_CELLS) "$::env(STD_CELL_LIBRARY)__ebuf*"
+set ::env(TRISTATE_CELLS) "$::env(STD_CELL_LIBRARY)__ebuf* $::env(STD_CELL_LIBRARY)__einv*"
diff --git a/sky130/librelane/sky130_fd_sc_ls/config.tcl b/sky130/librelane/sky130_fd_sc_ls/config.tcl
index 6ba1ca8..6aeab8f 100755
--- a/sky130/librelane/sky130_fd_sc_ls/config.tcl
+++ b/sky130/librelane/sky130_fd_sc_ls/config.tcl
@@ -48,4 +48,4 @@
 
 set ::env(PDN_RAIL_WIDTH) 0.48
 
-set ::env(TRISTATE_CELLS) "$::env(STD_CELL_LIBRARY)__ebuf*"
+set ::env(TRISTATE_CELLS) "$::env(STD_CELL_LIBRARY)__ebuf* $::env(STD_CELL_LIBRARY)__einv*"
diff --git a/sky130/librelane/sky130_fd_sc_ms/config.tcl b/sky130/librelane/sky130_fd_sc_ms/config.tcl
index 4aa9916..fa2783a 100755
--- a/sky130/librelane/sky130_fd_sc_ms/config.tcl
+++ b/sky130/librelane/sky130_fd_sc_ms/config.tcl
@@ -48,4 +48,4 @@
 
 set ::env(PDN_RAIL_WIDTH) 0.48
 
-set ::env(TRISTATE_CELLS) "$::env(STD_CELL_LIBRARY)__ebuf*"
+set ::env(TRISTATE_CELLS) "$::env(STD_CELL_LIBRARY)__ebuf* $::env(STD_CELL_LIBRARY)__einv*"