diff --git a/Installing-the-OBITools3.md b/Installing-the-OBITools3.md
index 51ad52f..ae1de31 100644
--- a/Installing-the-OBITools3.md
+++ b/Installing-the-OBITools3.md
@@ -29,7 +29,7 @@ Then you can install the OBITools3 in a virtual environment:
 		cd obitools3
 		python3 -m venv obi3-env
 		source obi3-env/bin/activate
-		pip install cython
+		pip3 install cython
 		python3 setup.py install
 		source obi_completion_script.bash