diff --git a/gravity.sh b/gravity.sh
index 910940af..a35ff8d7 100755
--- a/gravity.sh
+++ b/gravity.sh
@@ -139,9 +139,9 @@ update_gravity_timestamp() {
 # Import domains from file and store them in the specified database table
 database_table_from_file() {
   # Define locals
-  local table source backup_path backup_file tmpFile type
+  local table src backup_path backup_file tmpFile list_type
   table="${1}"
-  source="${2}"
+  src="${2}"
   backup_path="${piholeDir}/migration_backup"
   backup_file="${backup_path}/$(basename "${2}")"
   tmpFile="$(mktemp -p "/tmp" --suffix=".gravity")"
@@ -155,13 +155,13 @@ database_table_from_file() {
 
   # Special handling for domains to be imported into the common domainlist table
   if [[ "${table}" == "whitelist" ]]; then
-    type="0"
+    list_type="0"
     table="domainlist"
   elif [[ "${table}" == "blacklist" ]]; then
-    type="1"
+    list_type="1"
     table="domainlist"
   elif [[ "${table}" == "regex" ]]; then
-    type="3"
+    list_type="3"
     table="domainlist"
   fi
 
@@ -174,9 +174,9 @@ database_table_from_file() {
     rowid+=1
   fi
 
-  # Loop over all domains in ${source} file
+  # Loop over all domains in ${src} file
   # Read file line by line
-  grep -v '^ *#' < "${source}" | while IFS= read -r domain
+  grep -v '^ *#' < "${src}" | while IFS= read -r domain
   do
     # Only add non-empty lines
     if [[ -n "${domain}" ]]; then
@@ -185,10 +185,10 @@ database_table_from_file() {
         echo "${rowid},\"${domain}\",${timestamp}" >> "${tmpFile}"
       elif [[ "${table}" == "adlist" ]]; then
         # Adlist table format
-        echo "${rowid},\"${domain}\",1,${timestamp},${timestamp},\"Migrated from ${source}\",,0,0,0" >> "${tmpFile}"
+        echo "${rowid},\"${domain}\",1,${timestamp},${timestamp},\"Migrated from ${src}\",,0,0,0" >> "${tmpFile}"
       else
         # White-, black-, and regexlist table format
-        echo "${rowid},${type},\"${domain}\",1,${timestamp},${timestamp},\"Migrated from ${source}\"" >> "${tmpFile}"
+        echo "${rowid},${list_type},\"${domain}\",1,${timestamp},${timestamp},\"Migrated from ${src}\"" >> "${tmpFile}"
       fi
       rowid+=1
     fi
@@ -201,14 +201,14 @@ database_table_from_file() {
   status="$?"
 
   if [[ "${status}" -ne 0 ]]; then
-    echo -e "\\n  ${CROSS} Unable to fill table ${table}${type} in database ${gravityDBfile}\\n  ${output}"
+    echo -e "\\n  ${CROSS} Unable to fill table ${table}${list_type} in database ${gravityDBfile}\\n  ${output}"
     gravity_Cleanup "error"
   fi
 
   # Move source file to backup directory, create directory if not existing
   mkdir -p "${backup_path}"
-  mv "${source}" "${backup_file}" 2> /dev/null || \
-    echo -e "  ${CROSS} Unable to backup ${source} to ${backup_path}"
+  mv "${src}" "${backup_file}" 2> /dev/null || \
+    echo -e "  ${CROSS} Unable to backup ${src} to ${backup_path}"
 
   # Delete tmpFile
   rm "${tmpFile}" > /dev/null 2>&1 || \