diff --git a/files/usr/libexec/blue-merle b/files/usr/libexec/blue-merle
index 0ef4488..6d9ace4 100755
--- a/files/usr/libexec/blue-merle
+++ b/files/usr/libexec/blue-merle
@@ -27,7 +27,7 @@ elif [ "$1" == "read-imsi" ]; then
     fi
 
 elif [ "$1" == "random-imei" ]; then
-    /lib/blue-merle/imei_generate.py --random
+    flock -n /tmp/blue-merle-imei-generate.lock  timeout 15  /lib/blue-merle/imei_generate.py --random
     READ_IMEI
 
 elif [ "$1" == "shutdown-modem" ]; then