diff --git a/automount.sh b/automount.sh
index 2094774..13b7a88 100755
--- a/automount.sh
+++ b/automount.sh
@@ -162,7 +162,7 @@ case ${2} in
 
   (detach)
     __state_lock
-    grep -E "${1}$" ${STATE} \
+    grep -E "${PREFIX}/${1}$" ${STATE} \
       | while read DEV PROVIDER MNT
         do
           TARGET=$( mount | grep -E "^${PROVIDER} " | awk '{print $3}' )