diff --git a/PVE/API2/Nodes.pm b/PVE/API2/Nodes.pm
index 25f0e180..2db5e1ec 100644
--- a/PVE/API2/Nodes.pm
+++ b/PVE/API2/Nodes.pm
@@ -289,7 +289,7 @@ __PACKAGE__->register_method({
 	    total => $dinfo->{blocks},
 	    avail => $dinfo->{bavail},
 	    used => $dinfo->{used},
-	    free => $dinfo->{bavail} - $dinfo->{used},
+	    free => $dinfo->{blocks} - $dinfo->{used},
 	};
 
 	return $res;