diff --git a/check-incs.sh b/check-incs.sh
index 3cd6c36..fb9335e 100644
--- a/check-incs.sh
+++ b/check-incs.sh
@@ -5,35 +5,35 @@ EVOBACKUP_CONFIGS="/etc/evobackup/*"
 relative_date() {
     format=$(echo $1 | cut -d'.' -f1)
     time_jump=$(echo $1 | cut -d'.' -f2)
- 
+
     reference_date=$(date "${format}")
     past_date=$(date --date "${reference_date} ${time_jump}" +"%Y-%m-%d")
-    
+
     echo ${past_date}
 }
 inc_exists() {
-    ls -d /backup/incs/$1 > /dev/null 2>&1 
+    ls -d /backup/incs/$1 > /dev/null 2>&1
 }
 jail_exists() {
-    ls -d /backup/jails/$1 > /dev/null 2>&1 
+    ls -d /backup/jails/$1 > /dev/null 2>&1
 }
 # default return value is 0 (succes)
 rc=0
 # loop for each configured jail
 for file in ${EVOBACKUP_CONFIGS}; do
-    jail_name=$(basename $file) 
+    jail_name=$(basename ${file})
     # check if jail is present
     if jail_exists ${jail_name}; then
         # get jail last configuration date
-        jail_config_age=$(date --date "$(stat -c %y ${file})" +%s)
+        jail_config_age=$(date --date "$(stat -c %y ${file})" +"%s")
         # loop for each line in jail configuration
-        for line in $(cat $file); do
+        for line in $(cat ${file}); do
             # inc date in ISO format
-            inc_date=$(relative_date $line)
+            inc_date=$(relative_date ${line})
             # inc date in seconds from epoch
-            inc_age=$(date --date "${inc_date}" +%s)
-            # check if the configuration changed after the inc date 
-            if [ $jail_config_age -lt $inc_age ]; then
+            inc_age=$(date --date "${inc_date}" +"%s")
+            # check if the configuration changed after the inc date
+            if [ "${jail_config_age}" -lt "${inc_age}" ]; then
                 # Error if inc is not found
                 if ! inc_exists ${jail_name}/${inc_date}*; then
                     echo "ERROR: inc is missing \`${jail_name}/${inc_date}'" >&2