diff --git a/README.md b/README.md
index 93ceb459956cb7a491b19d2bc194048853b5bdb5..e1faafbcda42f42be9c4956f851caea5727db573 100644
--- a/README.md
+++ b/README.md
@@ -80,7 +80,7 @@ This installation guide is for ISIS users interested in installing ISIS (3.6.0)+
 
 6.  Download [Mamba](https://github.com/mamba-org/mamba). The ISIS environment is quite large and the Conda solver can take hours to resolve it. Instead, we recommend you use the much faster [Mamba](https://github.com/mamba-org/mamba) solver:
 
-        conda install -c conda-forge mamba
+        conda install -n base -c conda-forge mamba
 
 7.  The environment is now ready to download ISIS and its dependencies: