diff --git a/src/mergerfs.cpp b/src/mergerfs.cpp
index 666bf125..58e5f5cd 100644
--- a/src/mergerfs.cpp
+++ b/src/mergerfs.cpp
@@ -396,6 +396,7 @@ main(int    argc_,
 
   app.add_option("-f,--foreground",foreground)
     ->description("")
+    ->envname("MERGERFS_FOREGROUND")
     ->default_val(false);
 
   try