diff --git a/demo.sh b/demo.sh
index ccc64360..15fc6eb3 100755
--- a/demo.sh
+++ b/demo.sh
@@ -2,8 +2,8 @@
 
 echo -e "\nDemo of CubeSatSim sends FSK and BPSK telemetry alternately at 434.9 MHz continuously\n\n"
 
-sudo killall rpitx
-sudo killall sendiq
+sudo killall -9 rpitx
+sudo killall -9 sendiq
 sudo fuser -k 8080/tcp
 
 while true; do
@@ -11,15 +11,15 @@ while true; do
       echo -e "\n Changing mode ********************************************************************************\n\n"
       
       timeout 33 /home/pi/CubeSatSim/radioafsk fsk 3
-      sudo killall rpitx
-      sudo killall sendiq
+      sudo killall -9 rpitx
+      sudo killall -9 sendiq
       sudo fuser -k 8080/tcp
 
       sleep 1;
       echo -e "\n Changing mode ********************************************************************************\n\n"
       
       timeout 36 /home/pi/CubeSatSim/radioafsk bpsk 3
-      sudo killall rpitx
-      sudo killall sendiq
+      sudo killall -9 rpitx
+      sudo killall -9 sendiq
       sudo fuser -k 8080/tcp     
 done