diff --git a/cells/fill/sky130_fd_sc_hvl__fill_1.lef b/cells/fill/sky130_fd_sc_hvl__fill_1.lef
index 32d632a..776ddb3 100644
--- a/cells/fill/sky130_fd_sc_hvl__fill_1.lef
+++ b/cells/fill/sky130_fd_sc_hvl__fill_1.lef
@@ -19,7 +19,7 @@
 BUSBITCHARS "[]" ;
 DIVIDERCHAR "/" ;
 MACRO sky130_fd_sc_hvl__fill_1
-  CLASS CORE ;
+  CLASS CORE SPACER ;
   SOURCE USER ;
   ORIGIN  0.000000  0.000000 ;
   SIZE  0.480000 BY  4.070000 ;
diff --git a/cells/fill/sky130_fd_sc_hvl__fill_1.magic.lef b/cells/fill/sky130_fd_sc_hvl__fill_1.magic.lef
index a250951..860ad0d 100644
--- a/cells/fill/sky130_fd_sc_hvl__fill_1.magic.lef
+++ b/cells/fill/sky130_fd_sc_hvl__fill_1.magic.lef
@@ -22,7 +22,7 @@
   DATABASE MICRONS 200 ;
 END UNITS
 MACRO sky130_fd_sc_hvl__fill_1
-  CLASS CORE ;
+  CLASS CORE SPACER ;
   FOREIGN sky130_fd_sc_hvl__fill_1 ;
   ORIGIN  0.000000  0.000000 ;
   SIZE  0.480000 BY  4.070000 ;
diff --git a/cells/fill/sky130_fd_sc_hvl__fill_2.lef b/cells/fill/sky130_fd_sc_hvl__fill_2.lef
index dc368f4..642d744 100644
--- a/cells/fill/sky130_fd_sc_hvl__fill_2.lef
+++ b/cells/fill/sky130_fd_sc_hvl__fill_2.lef
@@ -19,7 +19,7 @@
 BUSBITCHARS "[]" ;
 DIVIDERCHAR "/" ;
 MACRO sky130_fd_sc_hvl__fill_2
-  CLASS CORE ;
+  CLASS CORE SPACER ;
   SOURCE USER ;
   ORIGIN  0.000000  0.000000 ;
   SIZE  0.960000 BY  4.070000 ;
diff --git a/cells/fill/sky130_fd_sc_hvl__fill_2.magic.lef b/cells/fill/sky130_fd_sc_hvl__fill_2.magic.lef
index b6ce352..6a65b8d 100644
--- a/cells/fill/sky130_fd_sc_hvl__fill_2.magic.lef
+++ b/cells/fill/sky130_fd_sc_hvl__fill_2.magic.lef
@@ -22,7 +22,7 @@
   DATABASE MICRONS 200 ;
 END UNITS
 MACRO sky130_fd_sc_hvl__fill_2
-  CLASS CORE ;
+  CLASS CORE SPACER ;
   FOREIGN sky130_fd_sc_hvl__fill_2 ;
   ORIGIN  0.000000  0.000000 ;
   SIZE  0.960000 BY  4.070000 ;
diff --git a/cells/fill/sky130_fd_sc_hvl__fill_4.lef b/cells/fill/sky130_fd_sc_hvl__fill_4.lef
index 50e86e9..dac87f0 100644
--- a/cells/fill/sky130_fd_sc_hvl__fill_4.lef
+++ b/cells/fill/sky130_fd_sc_hvl__fill_4.lef
@@ -19,7 +19,7 @@
 BUSBITCHARS "[]" ;
 DIVIDERCHAR "/" ;
 MACRO sky130_fd_sc_hvl__fill_4
-  CLASS CORE ;
+  CLASS CORE SPACER ;
   SOURCE USER ;
   ORIGIN  0.000000  0.000000 ;
   SIZE  1.920000 BY  4.070000 ;
diff --git a/cells/fill/sky130_fd_sc_hvl__fill_4.magic.lef b/cells/fill/sky130_fd_sc_hvl__fill_4.magic.lef
index 70da846..b6d9211 100644
--- a/cells/fill/sky130_fd_sc_hvl__fill_4.magic.lef
+++ b/cells/fill/sky130_fd_sc_hvl__fill_4.magic.lef
@@ -22,7 +22,7 @@
   DATABASE MICRONS 200 ;
 END UNITS
 MACRO sky130_fd_sc_hvl__fill_4
-  CLASS CORE ;
+  CLASS CORE SPACER ;
   FOREIGN sky130_fd_sc_hvl__fill_4 ;
   ORIGIN  0.000000  0.000000 ;
   SIZE  1.920000 BY  4.070000 ;
diff --git a/cells/fill/sky130_fd_sc_hvl__fill_8.lef b/cells/fill/sky130_fd_sc_hvl__fill_8.lef
index d22ec4a..02d6c11 100644
--- a/cells/fill/sky130_fd_sc_hvl__fill_8.lef
+++ b/cells/fill/sky130_fd_sc_hvl__fill_8.lef
@@ -19,7 +19,7 @@
 BUSBITCHARS "[]" ;
 DIVIDERCHAR "/" ;
 MACRO sky130_fd_sc_hvl__fill_8
-  CLASS CORE ;
+  CLASS CORE SPACER ;
   SOURCE USER ;
   ORIGIN  0.000000  0.000000 ;
   SIZE  3.840000 BY  4.070000 ;
diff --git a/cells/fill/sky130_fd_sc_hvl__fill_8.magic.lef b/cells/fill/sky130_fd_sc_hvl__fill_8.magic.lef
index 31b919a..203b238 100644
--- a/cells/fill/sky130_fd_sc_hvl__fill_8.magic.lef
+++ b/cells/fill/sky130_fd_sc_hvl__fill_8.magic.lef
@@ -22,7 +22,7 @@
   DATABASE MICRONS 200 ;
 END UNITS
 MACRO sky130_fd_sc_hvl__fill_8
-  CLASS CORE ;
+  CLASS CORE SPACER ;
   FOREIGN sky130_fd_sc_hvl__fill_8 ;
   ORIGIN  0.000000  0.000000 ;
   SIZE  3.840000 BY  4.070000 ;