diff --git a/Dockerfile b/Dockerfile
index d8b0b31..1532cd5 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,6 +2,8 @@ FROM python:3-alpine
 
 LABEL maintainer="Jakub Dorňák <jakub.dornak@misli.cz>"
 
+ENV PYTHONUNBUFFERED 1
+
 COPY . /src
 RUN pip install --no-cache-dir /src && rm -r /src
 
diff --git a/sentrylogs/parsers/nginx.py b/sentrylogs/parsers/nginx.py
index 31a76d6..24cd2b0 100644
--- a/sentrylogs/parsers/nginx.py
+++ b/sentrylogs/parsers/nginx.py
@@ -12,6 +12,7 @@
 referrer: "http://165.225.132.103/megapage/"
 """
 import re
+import sys
 
 from . import Parser
 from ..conf.settings import NGINX_ERROR_PATH
@@ -39,6 +40,9 @@ def get_sentry_log_level(self, level):
 
     def parse(self, line):
         """Parse a line of the Nginx error log"""
+        print(line, file=sys.stderr)
+        sys.stderr.flush()
+        
         csv_list = line.split(",")
 
         regex = re.match(self.pattern, csv_list.pop(0))