diff --git a/CHANGELOG.md b/CHANGELOG.md
index 495a0ba..bc354a1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,6 +1,7 @@
 ## 0.4.5 - xx/08/2017
 - Implemented driver subsystem for interfacing with other board
 - Added driver spb16ch for interfacing with "Smart Power Board 16 channel with RTC"
+- Fix problem with cron management on similar type cron
 
 ## 0.4.4 - 17/06/2017
 Remove lock/unlock from init function for resove bug
diff --git a/include/cron.include.sh b/include/cron.include.sh
index 56a1cad..fd1e1ce 100644
--- a/include/cron.include.sh
+++ b/include/cron.include.sh
@@ -15,8 +15,8 @@ function cron_del {
 	fi
 
 	$CRONTAB -l > "$TMP_CRON_FILE"
-	local START=`$GREP -n "# START cron $CRON_TYPE $CRON_ARG" "$TMP_CRON_FILE"| $CUT -d : -f 1`
-	local END=`$GREP -n "# END cron $CRON_TYPE $CRON_ARG" "$TMP_CRON_FILE"| $CUT -d : -f 1`
+	local START=`$GREP -n "^# START cron $CRON_TYPE $CRON_ARG$" "$TMP_CRON_FILE"| $CUT -d : -f 1`
+	local END=`$GREP -n "^# END cron $CRON_TYPE $CRON_ARG$" "$TMP_CRON_FILE"| $CUT -d : -f 1`
 	local re='^[0-9]+$'
 
 	if ! [[ "$START" =~ $re ]] && ! [[ "$END" =~ $re ]] ; then
@@ -79,8 +79,8 @@ function cron_add {
 	fi
 
 	$CRONTAB -l > "$TMP_CRON_FILE"
-	local START=`$GREP -n "# START cron $CRON_TYPE $CRON_ARG" "$TMP_CRON_FILE"| $CUT -d : -f 1`
-	local END=`$GREP -n "# END cron $CRON_TYPE $CRON_ARG" "$TMP_CRON_FILE"| $CUT -d : -f 1`
+	local START=`$GREP -n "^# START cron $CRON_TYPE $CRON_ARG$" "$TMP_CRON_FILE"| $CUT -d : -f 1`
+	local END=`$GREP -n "^# END cron $CRON_TYPE $CRON_ARG$" "$TMP_CRON_FILE"| $CUT -d : -f 1`
 	local re='^[0-9]+$'
 
 	local NEW_CRON=0
@@ -228,8 +228,8 @@ function cron_get {
 	fi
 
 	$CRONTAB -l > "$TMP_CRON_FILE"
-	local START=`$GREP -n "# START cron $CRON_TYPE $CRON_ARG" "$TMP_CRON_FILE"| $CUT -d : -f 1`
-	local END=`$GREP -n "# END cron $CRON_TYPE $CRON_ARG" "$TMP_CRON_FILE"| $CUT -d : -f 1`
+	local START=`$GREP -n "^# START cron $CRON_TYPE $CRON_ARG$" "$TMP_CRON_FILE"| $CUT -d : -f 1`
+	local END=`$GREP -n "^# END cron $CRON_TYPE $CRON_ARG$" "$TMP_CRON_FILE"| $CUT -d : -f 1`
 	local re='^[0-9]+$'
 
 	local PREVIUS_CONTENT=""