diff --git a/build/meta/com/google/android/update-binary b/build/meta/com/google/android/update-binary
index f4650fb..8dc0fd2 100644
--- a/build/meta/com/google/android/update-binary
+++ b/build/meta/com/google/android/update-binary
@@ -39,7 +39,7 @@ error_no_space() {
 }
 
 get_block_for_mount_point() {
-  grep -v "^#" /etc/recovery.fstab | grep " $1 " | tail -n1 | tr -s ' ' | cut -d' ' -f1
+  grep -v "^#" /etc/recovery.fstab | grep "[[:blank:]]$1[[:blank:]]" | tail -n1 | tr -s [:blank:] ' ' | cut -d' ' -f1
 }
 
 find_block() {