diff --git a/README.md b/README.md
index 761129d..673f736 100644
--- a/README.md
+++ b/README.md
@@ -50,7 +50,7 @@ docker images --format='{{.Repository}};{{.Tag}};{{.ID}}' | grep '<none>;<none>'
 # Get all used images tag in dir $PATH_ANALYSE
 find $PATH_ANALYSE -name 'Dockerfile*' | while read file; do cat $file; echo ''; done | grep -e FROM | cut -d ' ' -f 2 | sed $'s/[^[:print:]\t]//g' | sort -u | xargs -n1 docker pull
 # Calculate total docker images size
-docker images --format {{.ID}} | xargs -n1 docker inspect | jq '.[0]["Size"]' | paste -sd + | bc | format_bytes_str
+docker images --format {{.ID}} | xargs -n1 docker inspect | jq '.[0]["Size"]' | paste -sd + | bc | format_bytes
 ```
 
 ## Remove every user R packages