diff --git a/Makefile b/Makefile
index 29ca5d1..d56f8a5 100644
--- a/Makefile
+++ b/Makefile
@@ -45,7 +45,7 @@ archive: distclean
 	rm -rf EZFIO
 
 make.config: 
-	python configure.py
+	./configure.py
 
 veryclean:
 	$(MAKE) -C src veryclean
diff --git a/README.rst b/README.rst
index 459f1c8..32ff6e5 100644
--- a/README.rst
+++ b/README.rst
@@ -186,7 +186,7 @@ Create a file named ``create_input.py`` with:
 
 .. code-block:: python
 
-  #!/usr/bin/python
+  #!/usr/bin/python2
   
   import sys
   EZFIO = "./EZFIO"  # Put here the absolute path to the EZFIO directory
@@ -229,7 +229,7 @@ Execute the script:
 
 .. code-block:: bash
 
-  $ python create_input.py
+  $ python2 create_input.py
   18.0
 
 The printed mass is correct, and a new directory (``Water``) was created with our data:
diff --git a/build.ninja b/build.ninja
index bafb5d1..feeb8fa 100644
--- a/build.ninja
+++ b/build.ninja
@@ -1,7 +1,7 @@
 include version
 
 rule build_generated_ninja
-   command = python configure.py
+   command = python2 configure.py
    description = Creating generated.ninja
 
 rule run_ninja
diff --git a/configure.py b/configure.py
index 01ab439..cdedd88 100755
--- a/configure.py
+++ b/configure.py
@@ -116,11 +116,11 @@ rule build_libezfio_irp_a
    description = Building libezfio_irp.a
 
 rule build_python
-   command = cd src ; python create_python.py
+   command = cd src ; python2 create_python.py
    description = Building Python module
 
 rule build_ocaml
-   command = cd src ; python create_ocaml.py
+   command = cd src ; python2 create_ocaml.py
    description = Building Ocaml module
 
 build {irpf90_files}: compile_irpf90 | {irpf90_sources} {CONFIG_FILES}