diff --git a/oximeter/oximeter/schema/tfport-data-link.toml b/oximeter/oximeter/schema/tfport-data-link.toml
index 6492733227..573155b45f 100644
--- a/oximeter/oximeter/schema/tfport-data-link.toml
+++ b/oximeter/oximeter/schema/tfport-data-link.toml
@@ -54,11 +54,11 @@ type = "u8"
 description = "Wafer number of the switch the link is on"
 
 [fields.switch_wafer_loc_x]
-type = "i8"
+type = "i16"
 description = "X-coordinate wafer location of the switch the link is on"
 
 [fields.switch_wafer_loc_y]
-type = "i8"
+type = "i16"
 description = "Y-coordinate wafer location of the switch the link is on"
 
 [fields.switch_model]