diff --git a/_reformat-common.bash b/_reformat-common.bash
index ec4972a..2519d31 100644
--- a/_reformat-common.bash
+++ b/_reformat-common.bash
@@ -12,7 +12,7 @@ function get_os() {
     fi
 }
 
-## OPERATING_SYSTEM=$(get_os)
+OPERATING_SYSTEM=$(get_os)
 
 # For a given file, return its corresponding project root.
 function project_root() {