diff --git a/PVE/Storage/ZFSPlugin.pm b/PVE/Storage/ZFSPlugin.pm
index ca25402..9072205 100644
--- a/PVE/Storage/ZFSPlugin.pm
+++ b/PVE/Storage/ZFSPlugin.pm
@@ -51,7 +51,7 @@ my $zfs_get_base = sub {
 sub zfs_request {
     my ($class, $scfg, $timeout, $method, @params) = @_;
 
-    $timeout = PVE::RPCEnvironment::is_worker() ? 60*60 : 10
+    $timeout = PVE::RPCEnvironment->is_worker() ? 60*60 : 10
 	if !$timeout;
 
     my $msg = '';
diff --git a/PVE/Storage/ZFSPoolPlugin.pm b/PVE/Storage/ZFSPoolPlugin.pm
index 227244d..ca0a2cf 100644
--- a/PVE/Storage/ZFSPoolPlugin.pm
+++ b/PVE/Storage/ZFSPoolPlugin.pm
@@ -165,7 +165,7 @@ sub path {
 sub zfs_request {
     my ($class, $scfg, $timeout, $method, @params) = @_;
 
-    my $default_timeout = PVE::RPCEnvironment::is_worker() ? 60*60 : 5;
+    my $default_timeout = PVE::RPCEnvironment->is_worker() ? 60*60 : 5;
 
     my $cmd = [];