diff --git a/lib/coverband/adapters/hash_redis_store.rb b/lib/coverband/adapters/hash_redis_store.rb
index 3a6be103..f6068e7f 100644
--- a/lib/coverband/adapters/hash_redis_store.rb
+++ b/lib/coverband/adapters/hash_redis_store.rb
@@ -127,27 +127,12 @@ def save_report_script_input(key:, file:, file_hash:, data:, report_time:, updat
       end
 
       def hash_incr_script
-        @hash_incr_script ||= @redis.script(:load, <<~LUA)
-          local first_updated_at = table.remove(ARGV, 1)
-          local last_updated_at = table.remove(ARGV, 1)
-          local file = table.remove(ARGV, 1)
-          local file_hash = table.remove(ARGV, 1)
-          local ttl = table.remove(ARGV, 1)
-          local file_length = table.remove(ARGV, 1)
-          local hash_key = table.remove(KEYS, 1)
-          redis.call('HMSET', hash_key, '#{LAST_UPDATED_KEY}', last_updated_at, '#{FILE_KEY}', file, '#{FILE_HASH}', file_hash, '#{FILE_LENGTH_KEY}', file_length)
-          redis.call('HSETNX', hash_key, '#{FIRST_UPDATED_KEY}', first_updated_at)
-          for i, key in ipairs(KEYS) do
-            if ARGV[i] == '-1' then
-              redis.call("HSET", hash_key, key, ARGV[i])
-            else
-              redis.call("HINCRBY", hash_key, key, ARGV[i])
-            end
-          end
-          if ttl ~= '-1' then
-            redis.call("EXPIRE", hash_key, ttl)
-          end
-        LUA
+        @hash_incr_script ||= @redis.script(:load, lua_script_content)
+      end
+
+      def lua_script_content
+        File.read(File.join( 
+                            File.dirname(__FILE__), '../../../lua/lib/persist-coverage.lua'))
       end
 
       def values_from_redis(local_type, files)
diff --git a/lua/lib/persist-coverage.lua b/lua/lib/persist-coverage.lua
new file mode 100644
index 00000000..31c90469
--- /dev/null
+++ b/lua/lib/persist-coverage.lua
@@ -0,0 +1,19 @@
+local first_updated_at = table.remove(ARGV, 1)
+local last_updated_at = table.remove(ARGV, 1)
+local file = table.remove(ARGV, 1)
+local file_hash = table.remove(ARGV, 1)
+local ttl = table.remove(ARGV, 1)
+local file_length = table.remove(ARGV, 1)
+local hash_key = table.remove(KEYS, 1)
+redis.call('HMSET', hash_key, 'last_updated_at', last_updated_at, 'file', file, 'file_hash', file_hash, 'file_length', file_length)
+redis.call('HSETNX', hash_key, 'first_updated_at', first_updated_at)
+for i, key in ipairs(KEYS) do
+  if ARGV[i] == '-1' then
+    redis.call("HSET", hash_key, key, ARGV[i])
+  else
+    redis.call("HINCRBY", hash_key, key, ARGV[i])
+  end
+end
+if ttl ~= '-1' then
+  redis.call("EXPIRE", hash_key, ttl)
+end