diff --git a/database/artix7/settings.sh b/database/artix7/settings.sh
index d9dde9cd..a99321e5 100644
--- a/database/artix7/settings.sh
+++ b/database/artix7/settings.sh
@@ -4,6 +4,10 @@ export XRAY_DATABASE="artix7"
 export XRAY_PART="xc7a50tfgg484-1"
 export XRAY_ROI="SLICE_X12Y100:SLICE_X27Y149"
 export XRAY_ROI_FRAMES="0x00020500:0x000208ff"
+export XRAY_ROI_GRID_X1="29"
+export XRAY_ROI_GRID_X2="47"
+export XRAY_ROI_GRID_Y1="0"
+export XRAY_ROI_GRID_Y2="52"
 export XRAY_PIN_00="E22"
 export XRAY_PIN_01="D22"
 export XRAY_PIN_02="E21"
diff --git a/fuzzers/005-tilegrid/generate.tcl b/fuzzers/005-tilegrid/generate.tcl
index 2be70d82..60749f9d 100644
--- a/fuzzers/005-tilegrid/generate.tcl
+++ b/fuzzers/005-tilegrid/generate.tcl
@@ -22,10 +22,17 @@ set luts [get_bels -of_objects [get_sites -of_objects [get_pblocks roi]] -filter
 set selected_luts {}
 set lut_index 0
 
-set grid_min_x -1
-set grid_max_x -1
-set grid_min_y -1
-set grid_max_y -1
+if 0 {
+	set grid_min_x -1
+	set grid_max_x -1
+	set grid_min_y -1
+	set grid_max_y -1
+} {
+	set grid_min_x $::env(XRAY_ROI_GRID_X1)
+	set grid_max_x $::env(XRAY_ROI_GRID_X2)
+	set grid_min_y $::env(XRAY_ROI_GRID_Y1)
+	set grid_max_y $::env(XRAY_ROI_GRID_Y2)
+}
 
 foreach lut $luts {
 	set tile [get_tile -of_objects $lut]