diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 7b25669aee0..bd5ebc13ebd 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -242,7 +242,7 @@ conda env create
 Before building and testing the project, you have to activate the environment:
 
 ```bash
-source activate ENVIRONMENT_NAME
+conda activate pygmt
 ```
 
 You'll need to do this every time you start a new terminal.