diff --git a/usr/lib/security-misc/apt-get-update b/usr/lib/security-misc/apt-get-update
index 660d09e..0d9b7be 100755
--- a/usr/lib/security-misc/apt-get-update
+++ b/usr/lib/security-misc/apt-get-update
@@ -12,7 +12,7 @@ sigterm_trap() {
       ## Already terminated.
       exit 143
    fi
-   kill -sigterm "$lastpid"
+   kill -s sigterm "$lastpid"
    exit 143
 }