diff --git a/flow/designs/gf180/uart-blocks/tapcell.tcl b/flow/designs/gf180/uart-blocks/tapcell.tcl
index aa4a9daa9d..185fb32dd9 100644
--- a/flow/designs/gf180/uart-blocks/tapcell.tcl
+++ b/flow/designs/gf180/uart-blocks/tapcell.tcl
@@ -1,5 +1,4 @@
 tapcell \
-  -endcap_cpp "12" \
   -distance 100 \
   -tapcell_master $::env(TIE_CELL) \
   -endcap_master $::env(ENDCAP_CELL) \
diff --git a/flow/platforms/gf180/openROAD/tapcell.tcl b/flow/platforms/gf180/openROAD/tapcell.tcl
index 24ebce5587..9620fa39d8 100644
--- a/flow/platforms/gf180/openROAD/tapcell.tcl
+++ b/flow/platforms/gf180/openROAD/tapcell.tcl
@@ -1,5 +1,4 @@
 tapcell \
-  -endcap_cpp "12" \
   -distance 100 \
   -tapcell_master $::env(TIE_CELL) \
   -endcap_master $::env(ENDCAP_CELL)