diff --git a/Makefile b/Makefile
index 14a2aea729c87526a76c642cfdcc090770d060ed..ec6e2b608edfd82817afa1c2be84db829e77c832 100644
--- a/Makefile
+++ b/Makefile
@@ -7,7 +7,7 @@ PY_FILES += $(wildcard src/*.py)
 
 default: bin ${PY_FILES}
 	@cp ${PY_FILES} bin/${DIRNAME}
-	@echo "#!/usr/bin/env python\nimport sys\nsys.path.append(sys.path[0]+'/${DIRNAME}')\nfrom ${MODNAME} import main\nif __name__ == '__main__':\n    main()\n" > bin/${NAME}
+	@echo "#!/usr/bin/env python3\nimport sys\nsys.path.append(sys.path[0]+'/${DIRNAME}')\nfrom ${MODNAME} import main\nif __name__ == '__main__':\n    main()\n" > bin/${NAME}
 	@chmod +x bin/${NAME} bin/${DIRNAME}/${MAIN}
 
 bin:
diff --git a/src/SlDecimators.py b/src/SlDecimators.py
index 0a02cf0dd73fedae161f2b37ef4e7d882efaa9e3..e3f8944eb7ae60668e9e0d51604f44b7307f23b1 100644
--- a/src/SlDecimators.py
+++ b/src/SlDecimators.py
@@ -1,5 +1,6 @@
-#!/usr/bin/python3
-#-*- coding: utf-8 -*-
+#!/usr/bin/env python3
+# -*- coding:utf-8 -*-
+
 
 import PyTango
 from PyQt4.QtCore import *
@@ -1414,13 +1415,6 @@ class LineEditRO(QLineEdit):
         self.setStyleSheet("background-color: rgb(200, 200, 200)")
 
 
-def main():
-    app = QApplication([])
-    window = MainWindow()
-    window.show()
-    app.exec_()
-    pass
-
-
-if __name__ == "__main__":
-    main()
+app = QApplication([])
+main = MainWindow()
+app.exec_()
\ No newline at end of file