diff --git a/CI/scripts/targeting_designs.sh b/CI/scripts/targeting_designs.sh
index 4d988a16..87d069de 100644
--- a/CI/scripts/targeting_designs.sh
+++ b/CI/scripts/targeting_designs.sh
@@ -16,14 +16,16 @@ MLPATH=/opt/MATLAB
 
 cd ../.. 
 source /opt/Xilinx/Vivado/2022.2/settings64.sh
-Xvfb :77 &
-export DISPLAY=:77
+# Randomize DISPLAY number to avoid conflicts
+export DISPLAY_ID=:$(shuf -i 10-1000 -n 1)
+Xvfb :$DISPLAY_ID &
+XVFB_PID=$!
+export DISPLAY=:$DISPLAY_ID
 export SWT_GTK3=0
 source /opt/Xilinx/Vivado/2022.2/settings64.sh
 $MLPATH/$MLRELEASE/bin/matlab $MLFLAGS -r "addpath(genpath('test'));addpath(genpath('deps'));runDemoTests('$DEMO');"
 EC=$?
-pidof Xvfb
-if [ $? -eq 0 ]; then
-	kill -9 `pidof Xvfb`
-fi
-exit $EC
\ No newline at end of file
+sleep 5
+kill -9 $XVFB_PID || true
+exit $EC
+