diff --git a/Dockerfile b/Dockerfile
index 5f900ab..7e0e68d 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -15,4 +15,4 @@ COPY ./zadanie1.py ./
 
 RUN chmod +x ./zadanie1.py
 
-CMD ./zadanie1.py
\ No newline at end of file
+CMD python ./zadanie1.py
\ No newline at end of file
diff --git a/zadanie1.py b/zadanie1.py
index 7bfd817..7a2dd49 100644
--- a/zadanie1.py
+++ b/zadanie1.py
@@ -1,3 +1,5 @@
+#!/usr/bin/python
+
 import pandas as pd
 import numpy as np