diff --git a/cells/fill/sky130_fd_sc_ls__fill_1.lef b/cells/fill/sky130_fd_sc_ls__fill_1.lef
index 13565ed..d6882a9 100644
--- a/cells/fill/sky130_fd_sc_ls__fill_1.lef
+++ b/cells/fill/sky130_fd_sc_ls__fill_1.lef
@@ -19,7 +19,7 @@
 BUSBITCHARS "[]" ;
 DIVIDERCHAR "/" ;
 MACRO sky130_fd_sc_ls__fill_1
-  CLASS CORE ;
+  CLASS CORE SPACER ;
   SOURCE USER ;
   ORIGIN  0.000000  0.000000 ;
   SIZE  0.480000 BY  3.330000 ;
diff --git a/cells/fill/sky130_fd_sc_ls__fill_1.magic.lef b/cells/fill/sky130_fd_sc_ls__fill_1.magic.lef
index 28c6ce8..657ce2d 100644
--- a/cells/fill/sky130_fd_sc_ls__fill_1.magic.lef
+++ b/cells/fill/sky130_fd_sc_ls__fill_1.magic.lef
@@ -22,7 +22,7 @@
   DATABASE MICRONS 200 ;
 END UNITS
 MACRO sky130_fd_sc_ls__fill_1
-  CLASS CORE ;
+  CLASS CORE SPACER ;
   FOREIGN sky130_fd_sc_ls__fill_1 ;
   ORIGIN  0.000000  0.000000 ;
   SIZE  0.480000 BY  3.330000 ;
diff --git a/cells/fill/sky130_fd_sc_ls__fill_2.lef b/cells/fill/sky130_fd_sc_ls__fill_2.lef
index 09fefdb..de17809 100644
--- a/cells/fill/sky130_fd_sc_ls__fill_2.lef
+++ b/cells/fill/sky130_fd_sc_ls__fill_2.lef
@@ -19,7 +19,7 @@
 BUSBITCHARS "[]" ;
 DIVIDERCHAR "/" ;
 MACRO sky130_fd_sc_ls__fill_2
-  CLASS CORE ;
+  CLASS CORE SPACER ;
   SOURCE USER ;
   ORIGIN  0.000000  0.000000 ;
   SIZE  0.960000 BY  3.330000 ;
diff --git a/cells/fill/sky130_fd_sc_ls__fill_2.magic.lef b/cells/fill/sky130_fd_sc_ls__fill_2.magic.lef
index bf28d2d..447fa07 100644
--- a/cells/fill/sky130_fd_sc_ls__fill_2.magic.lef
+++ b/cells/fill/sky130_fd_sc_ls__fill_2.magic.lef
@@ -22,7 +22,7 @@
   DATABASE MICRONS 200 ;
 END UNITS
 MACRO sky130_fd_sc_ls__fill_2
-  CLASS CORE ;
+  CLASS CORE SPACER ;
   FOREIGN sky130_fd_sc_ls__fill_2 ;
   ORIGIN  0.000000  0.000000 ;
   SIZE  0.960000 BY  3.330000 ;
diff --git a/cells/fill/sky130_fd_sc_ls__fill_4.lef b/cells/fill/sky130_fd_sc_ls__fill_4.lef
index ef508f7..d318b32 100644
--- a/cells/fill/sky130_fd_sc_ls__fill_4.lef
+++ b/cells/fill/sky130_fd_sc_ls__fill_4.lef
@@ -19,7 +19,7 @@
 BUSBITCHARS "[]" ;
 DIVIDERCHAR "/" ;
 MACRO sky130_fd_sc_ls__fill_4
-  CLASS CORE ;
+  CLASS CORE SPACER ;
   SOURCE USER ;
   ORIGIN  0.000000  0.000000 ;
   SIZE  1.920000 BY  3.330000 ;
diff --git a/cells/fill/sky130_fd_sc_ls__fill_4.magic.lef b/cells/fill/sky130_fd_sc_ls__fill_4.magic.lef
index 40e3e41..79cb064 100644
--- a/cells/fill/sky130_fd_sc_ls__fill_4.magic.lef
+++ b/cells/fill/sky130_fd_sc_ls__fill_4.magic.lef
@@ -22,7 +22,7 @@
   DATABASE MICRONS 200 ;
 END UNITS
 MACRO sky130_fd_sc_ls__fill_4
-  CLASS CORE ;
+  CLASS CORE SPACER ;
   FOREIGN sky130_fd_sc_ls__fill_4 ;
   ORIGIN  0.000000  0.000000 ;
   SIZE  1.920000 BY  3.330000 ;
diff --git a/cells/fill/sky130_fd_sc_ls__fill_8.lef b/cells/fill/sky130_fd_sc_ls__fill_8.lef
index 809c08a..bd794e3 100644
--- a/cells/fill/sky130_fd_sc_ls__fill_8.lef
+++ b/cells/fill/sky130_fd_sc_ls__fill_8.lef
@@ -19,7 +19,7 @@
 BUSBITCHARS "[]" ;
 DIVIDERCHAR "/" ;
 MACRO sky130_fd_sc_ls__fill_8
-  CLASS CORE ;
+  CLASS CORE SPACER ;
   SOURCE USER ;
   ORIGIN  0.000000  0.000000 ;
   SIZE  3.840000 BY  3.330000 ;
diff --git a/cells/fill/sky130_fd_sc_ls__fill_8.magic.lef b/cells/fill/sky130_fd_sc_ls__fill_8.magic.lef
index c1ebbcf..731c6c0 100644
--- a/cells/fill/sky130_fd_sc_ls__fill_8.magic.lef
+++ b/cells/fill/sky130_fd_sc_ls__fill_8.magic.lef
@@ -22,7 +22,7 @@
   DATABASE MICRONS 200 ;
 END UNITS
 MACRO sky130_fd_sc_ls__fill_8
-  CLASS CORE ;
+  CLASS CORE SPACER ;
   FOREIGN sky130_fd_sc_ls__fill_8 ;
   ORIGIN  0.000000  0.000000 ;
   SIZE  3.840000 BY  3.330000 ;
diff --git a/cells/fill_diode/sky130_fd_sc_ls__fill_diode_2.lef b/cells/fill_diode/sky130_fd_sc_ls__fill_diode_2.lef
index 1a67e50..c294258 100644
--- a/cells/fill_diode/sky130_fd_sc_ls__fill_diode_2.lef
+++ b/cells/fill_diode/sky130_fd_sc_ls__fill_diode_2.lef
@@ -19,7 +19,7 @@
 BUSBITCHARS "[]" ;
 DIVIDERCHAR "/" ;
 MACRO sky130_fd_sc_ls__fill_diode_2
-  CLASS CORE ;
+  CLASS CORE SPACER ;
   SOURCE USER ;
   ORIGIN  0.000000  0.000000 ;
   SIZE  0.960000 BY  3.330000 ;
diff --git a/cells/fill_diode/sky130_fd_sc_ls__fill_diode_2.magic.lef b/cells/fill_diode/sky130_fd_sc_ls__fill_diode_2.magic.lef
index 8cfa92e..bb1fee4 100644
--- a/cells/fill_diode/sky130_fd_sc_ls__fill_diode_2.magic.lef
+++ b/cells/fill_diode/sky130_fd_sc_ls__fill_diode_2.magic.lef
@@ -22,7 +22,7 @@
   DATABASE MICRONS 200 ;
 END UNITS
 MACRO sky130_fd_sc_ls__fill_diode_2
-  CLASS CORE ;
+  CLASS CORE SPACER ;
   FOREIGN sky130_fd_sc_ls__fill_diode_2 ;
   ORIGIN  0.000000  0.000000 ;
   SIZE  0.960000 BY  3.330000 ;
diff --git a/cells/fill_diode/sky130_fd_sc_ls__fill_diode_4.lef b/cells/fill_diode/sky130_fd_sc_ls__fill_diode_4.lef
index b874d14..b0d5c77 100644
--- a/cells/fill_diode/sky130_fd_sc_ls__fill_diode_4.lef
+++ b/cells/fill_diode/sky130_fd_sc_ls__fill_diode_4.lef
@@ -19,7 +19,7 @@
 BUSBITCHARS "[]" ;
 DIVIDERCHAR "/" ;
 MACRO sky130_fd_sc_ls__fill_diode_4
-  CLASS CORE ;
+  CLASS CORE SPACER ;
   SOURCE USER ;
   ORIGIN  0.000000  0.000000 ;
   SIZE  1.920000 BY  3.330000 ;
diff --git a/cells/fill_diode/sky130_fd_sc_ls__fill_diode_4.magic.lef b/cells/fill_diode/sky130_fd_sc_ls__fill_diode_4.magic.lef
index 1b7e619..6696b93 100644
--- a/cells/fill_diode/sky130_fd_sc_ls__fill_diode_4.magic.lef
+++ b/cells/fill_diode/sky130_fd_sc_ls__fill_diode_4.magic.lef
@@ -22,7 +22,7 @@
   DATABASE MICRONS 200 ;
 END UNITS
 MACRO sky130_fd_sc_ls__fill_diode_4
-  CLASS CORE ;
+  CLASS CORE SPACER ;
   FOREIGN sky130_fd_sc_ls__fill_diode_4 ;
   ORIGIN  0.000000  0.000000 ;
   SIZE  1.920000 BY  3.330000 ;
diff --git a/cells/fill_diode/sky130_fd_sc_ls__fill_diode_8.lef b/cells/fill_diode/sky130_fd_sc_ls__fill_diode_8.lef
index bbfe468..0af1cfc 100644
--- a/cells/fill_diode/sky130_fd_sc_ls__fill_diode_8.lef
+++ b/cells/fill_diode/sky130_fd_sc_ls__fill_diode_8.lef
@@ -19,7 +19,7 @@
 BUSBITCHARS "[]" ;
 DIVIDERCHAR "/" ;
 MACRO sky130_fd_sc_ls__fill_diode_8
-  CLASS CORE ;
+  CLASS CORE SPACER ;
   SOURCE USER ;
   ORIGIN  0.000000  0.000000 ;
   SIZE  3.840000 BY  3.330000 ;
diff --git a/cells/fill_diode/sky130_fd_sc_ls__fill_diode_8.magic.lef b/cells/fill_diode/sky130_fd_sc_ls__fill_diode_8.magic.lef
index f44a3b8..070b24f 100644
--- a/cells/fill_diode/sky130_fd_sc_ls__fill_diode_8.magic.lef
+++ b/cells/fill_diode/sky130_fd_sc_ls__fill_diode_8.magic.lef
@@ -22,7 +22,7 @@
   DATABASE MICRONS 200 ;
 END UNITS
 MACRO sky130_fd_sc_ls__fill_diode_8
-  CLASS CORE ;
+  CLASS CORE SPACER ;
   FOREIGN sky130_fd_sc_ls__fill_diode_8 ;
   ORIGIN  0.000000  0.000000 ;
   SIZE  3.840000 BY  3.330000 ;