diff --git a/rootfs/etc/cont-init.d/firefox.sh b/rootfs/etc/cont-init.d/firefox.sh
index ef1336d..eb6c90d 100755
--- a/rootfs/etc/cont-init.d/firefox.sh
+++ b/rootfs/etc/cont-init.d/firefox.sh
@@ -20,9 +20,9 @@ fi
 # Verify the size of /dev/shm.
 SHM_SIZE_MB="$(df -m /dev/shm | tail -n 1 | tr -s ' ' | cut -d ' ' -f2)"
 if [ "$SHM_SIZE_MB" -eq 64 ]; then
-   echo 'FAIL' > /tmp/.firefox_shm_check
+   echo 'SHM_CHECK_FAIL' > /tmp/.firefox_shm_check
 else
-   echo 'PASS' > /tmp/.firefox_shm_check
+   echo 'SHM_CHECK_PASS' > /tmp/.firefox_shm_check
 fi
 
 if /usr/bin/membarrier_check 2>/dev/null; then
diff --git a/rootfs/etc/logmonitor/notifications.d/shm_size/filter b/rootfs/etc/logmonitor/notifications.d/shm_size/filter
index 8b78571..914e41d 100755
--- a/rootfs/etc/logmonitor/notifications.d/shm_size/filter
+++ b/rootfs/etc/logmonitor/notifications.d/shm_size/filter
@@ -5,8 +5,8 @@ set -u # Treat unset variables as an error.
 
 LINE="$1"
 
-if [ "$LINE" = "FAIL" ]; then
-    echo 'ACK' > /tmp/.firefox_shm_check
+if [ "$LINE" = "SHM_CHECK_FAIL" ]; then
+    echo 'SHM_CHECK_ACK' > /tmp/.firefox_shm_check
     exit 0
 fi