diff --git a/hammer/technology/asap7/defaults.yml b/hammer/technology/asap7/defaults.yml
index 21dec3bdf..c9c5347db 100644
--- a/hammer/technology/asap7/defaults.yml
+++ b/hammer/technology/asap7/defaults.yml
@@ -36,7 +36,7 @@ vlsi:
 
     bump_block_cut_layer: "V9" # Set the layer that blocks vias under bumps
 
-    tap_cell_interval: 50 # Set the interval and offset for tap cells
+    tap_cell_interval: 50.0 # Set the interval and offset for tap cells
     tap_cell_offset: 10.564 # Set the interval and offset for tap cells
 
 
diff --git a/hammer/technology/sky130/defaults.yml b/hammer/technology/sky130/defaults.yml
index bc2ced758..d1be2af6f 100644
--- a/hammer/technology/sky130/defaults.yml
+++ b/hammer/technology/sky130/defaults.yml
@@ -83,8 +83,8 @@ vlsi:
 
     bump_block_cut_layer: "via4" # Set the layer that blocks vias under bumps
 
-    tap_cell_interval: 15 # Set the interval and offset for tap cells
-    tap_cell_offset: 5
+    tap_cell_interval: 15.0 # Set the interval and offset for tap cells
+    tap_cell_offset: 5.0
 
 technology.core:
   stackup: "sky130_fd_sc_hd" # This key should exist in the stackups list in the tech json