diff --git a/sky130/openlane/sky130_fd_sc_hd/config.tcl b/sky130/openlane/sky130_fd_sc_hd/config.tcl
index 38a9336..5dd15e8 100755
--- a/sky130/openlane/sky130_fd_sc_hd/config.tcl
+++ b/sky130/openlane/sky130_fd_sc_hd/config.tcl
@@ -13,6 +13,9 @@
 
 set ::env(LIB_TYPICAL) $::env(LIB_SYNTH)
 
+# Default No Synth List
+set ::env(NO_SYNTH_LIST) "$::env(PDK_ROOT)/$::env(PDK)/libs.tech/openlane/$::env(STD_CELL_LIBRARY)/no_synth.cells"
+
 # Placement site for core cells
 # This can be found in the technology lef
 set ::env(PLACE_SITE) "unithd"
diff --git a/sky130/openlane/sky130_fd_sc_hdll/config.tcl b/sky130/openlane/sky130_fd_sc_hdll/config.tcl
index 97e4ece..4d9d8a0 100755
--- a/sky130/openlane/sky130_fd_sc_hdll/config.tcl
+++ b/sky130/openlane/sky130_fd_sc_hdll/config.tcl
@@ -13,6 +13,9 @@
 
 set ::env(LIB_TYPICAL) $::env(LIB_SYNTH)
 
+# Default No Synth List
+set ::env(NO_SYNTH_LIST) "$::env(PDK_ROOT)/$::env(PDK)/libs.tech/openlane/$::env(STD_CELL_LIBRARY)/no_synth.cells"
+
 # Placement site for core cells
 # This can be found in the technology lef
 set ::env(PLACE_SITE) "unithd"
diff --git a/sky130/openlane/sky130_fd_sc_hs/config.tcl b/sky130/openlane/sky130_fd_sc_hs/config.tcl
index 7b190de..7f39025 100755
--- a/sky130/openlane/sky130_fd_sc_hs/config.tcl
+++ b/sky130/openlane/sky130_fd_sc_hs/config.tcl
@@ -13,6 +13,9 @@
 
 set ::env(LIB_TYPICAL) $::env(LIB_SYNTH)
 
+# Default No Synth List
+set ::env(NO_SYNTH_LIST) "$::env(PDK_ROOT)/$::env(PDK)/libs.tech/openlane/$::env(STD_CELL_LIBRARY)/no_synth.cells"
+
 # Placement site for core cells
 # This can be found in the technology lef
 set ::env(PLACE_SITE) "unit"
diff --git a/sky130/openlane/sky130_fd_sc_hvl/config.tcl b/sky130/openlane/sky130_fd_sc_hvl/config.tcl
index dc55bae..f9870a5 100644
--- a/sky130/openlane/sky130_fd_sc_hvl/config.tcl
+++ b/sky130/openlane/sky130_fd_sc_hvl/config.tcl
@@ -19,6 +19,9 @@
 
 set ::env(LIB_TYPICAL) $::env(LIB_SYNTH)
 
+# Default No Synth List
+set ::env(NO_SYNTH_LIST) "$::env(PDK_ROOT)/$::env(PDK)/libs.tech/openlane/$::env(STD_CELL_LIBRARY)/no_synth.cells"
+
 # Placement site for core cells
 # This can be found in the technology lef
 set ::env(PLACE_SITE) "unithv"
diff --git a/sky130/openlane/sky130_fd_sc_ls/config.tcl b/sky130/openlane/sky130_fd_sc_ls/config.tcl
index 50dfb80..a35808d 100755
--- a/sky130/openlane/sky130_fd_sc_ls/config.tcl
+++ b/sky130/openlane/sky130_fd_sc_ls/config.tcl
@@ -13,6 +13,9 @@
 
 set ::env(LIB_TYPICAL) $::env(LIB_SYNTH)
 
+# Default No Synth List
+set ::env(NO_SYNTH_LIST) "$::env(PDK_ROOT)/$::env(PDK)/libs.tech/openlane/$::env(STD_CELL_LIBRARY)/no_synth.cells"
+
 # Placement site for core cells
 # This can be found in the technology lef
 set ::env(PLACE_SITE) "unit"
diff --git a/sky130/openlane/sky130_fd_sc_ms/config.tcl b/sky130/openlane/sky130_fd_sc_ms/config.tcl
index 2da0733..b32d358 100755
--- a/sky130/openlane/sky130_fd_sc_ms/config.tcl
+++ b/sky130/openlane/sky130_fd_sc_ms/config.tcl
@@ -13,6 +13,10 @@
 
 set ::env(LIB_TYPICAL) $::env(LIB_SYNTH)
 
+# Default No Synth List
+set ::env(NO_SYNTH_LIST) "$::env(PDK_ROOT)/$::env(PDK)/libs.tech/openlane/$::env(STD_CELL_LIBRARY)/no_synth.cells"
+
+
 # Placement site for core cells
 # This can be found in the technology lef
 set ::env(PLACE_SITE) "unit"