diff --git a/installer/installer.sh b/installer/installer.sh
index 0ed3180..e431727 100755
--- a/installer/installer.sh
+++ b/installer/installer.sh
@@ -132,7 +132,7 @@ FORMAT_CMD="/sbin/mkfs.$INSTALL_FSTYPE"
 
 case "$INSTALL_FSTYPE" in
    ext2|ext3|ext4|jfs|nilfs2)
-         [ "$INSTALL_BADBLOCKS" ] && FORMAT_APPEND="-c"
+         [ "$INSTALL_BADBLOCKS" = "1" ] && FORMAT_APPEND="-c"
          [ "$INSTALL_HOSTNAME" ] && \
             FORMAT_APPEND="$FORMAT_APPEND -L $INSTALL_HOSTNAME"
          ;;
@@ -162,7 +162,7 @@ if [ "$INSTALL_HOME_DEVICE" ]; then
    FORMAT_HOME_CMD="/sbin/mkfs.$INSTALL_HOME_FSTYPE"
    case "$INSTALL_HOME_FSTYPE" in
       ext2|ext3|ext4|jfs|nilfs2)
-               [ "$INSTALL_HOME_BADBLOCKS" ] && FORMAT_HOME_APPEND="-c"
+               [ "$INSTALL_HOME_BADBLOCKS" = "1" ] && FORMAT_HOME_APPEND="-c"
                FORMAT_HOME_APPEND="$FORMAT_HOME_APPEND -L home"
                ;;
       btrfs|xfs|reiser4)
@@ -188,7 +188,7 @@ if [ "$INSTALL_BOOT_DEVICE" ]; then
    FORMAT_BOOT_CMD="/sbin/mkfs.$INSTALL_BOOT_FSTYPE"
    case "$INSTALL_BOOT_FSTYPE" in
       ext2|ext3|ext4|jfs|nilfs2)
-               [ "$INSTALL_BOOT_BADBLOCKS" ] && FORMAT_BOOT_APPEND="-c"
+               [ "$INSTALL_BOOT_BADBLOCKS" = "1" ] && FORMAT_BOOT_APPEND="-c"
                FORMAT_BOOT_APPEND="$FORMAT_BOOT_APPEND -L boot"
                ;;
       btrfs|xfs|reiser4)