diff --git a/PVE/Storage/CIFSPlugin.pm b/PVE/Storage/CIFSPlugin.pm
index 7ec7164..36339db 100644
--- a/PVE/Storage/CIFSPlugin.pm
+++ b/PVE/Storage/CIFSPlugin.pm
@@ -168,6 +168,8 @@ sub on_add_hook {
     } else {
 	cifs_delete_credentials($storeid);
     }
+
+    return;
 }
 
 sub on_update_hook {
@@ -183,12 +185,16 @@ sub on_update_hook {
     } else {
 	cifs_delete_credentials($storeid);
     }
+
+    return;
 }
 
 sub on_delete_hook {
     my ($class, $storeid, $scfg) = @_;
 
     cifs_delete_credentials($storeid);
+
+    return;
 }
 
 sub status {
diff --git a/PVE/Storage/CephFSPlugin.pm b/PVE/Storage/CephFSPlugin.pm
index 880ec05..8eb7c70 100644
--- a/PVE/Storage/CephFSPlugin.pm
+++ b/PVE/Storage/CephFSPlugin.pm
@@ -170,6 +170,8 @@ sub on_add_hook {
     return if defined($scfg->{monhost}); # nothing to do if not pve managed ceph
 
     PVE::CephConfig::ceph_create_keyfile($scfg->{type}, $storeid);
+
+    return;
 }
 
 sub on_delete_hook {
@@ -178,6 +180,8 @@ sub on_delete_hook {
     return if defined($scfg->{monhost}); # nothing to do if not pve managed ceph
 
     PVE::CephConfig::ceph_remove_keyfile($scfg->{type}, $storeid);
+
+    return;
 }
 
 sub status {
diff --git a/PVE/Storage/LVMPlugin.pm b/PVE/Storage/LVMPlugin.pm
index c0740d4..73e8e48 100644
--- a/PVE/Storage/LVMPlugin.pm
+++ b/PVE/Storage/LVMPlugin.pm
@@ -269,6 +269,8 @@ sub on_add_hook {
 
 	lvm_create_volume_group($path, $scfg->{vgname}, $scfg->{shared});
     }
+
+    return;
 }
 
 sub parse_volname {
diff --git a/PVE/Storage/PBSPlugin.pm b/PVE/Storage/PBSPlugin.pm
index d1db4a9..380c976 100644
--- a/PVE/Storage/PBSPlugin.pm
+++ b/PVE/Storage/PBSPlugin.pm
@@ -452,6 +452,8 @@ sub on_delete_hook {
 
     pbs_delete_password($scfg, $storeid);
     pbs_delete_encryption_key($scfg, $storeid);
+
+    return;
 }
 
 sub parse_volname {
diff --git a/PVE/Storage/RBDPlugin.pm b/PVE/Storage/RBDPlugin.pm
index 94df89d..fab6d57 100644
--- a/PVE/Storage/RBDPlugin.pm
+++ b/PVE/Storage/RBDPlugin.pm
@@ -317,6 +317,8 @@ sub on_add_hook {
     return if defined($scfg->{monhost}); # nothing to do if not pve managed ceph
 
     PVE::CephConfig::ceph_create_keyfile($scfg->{type}, $storeid);
+
+    return;
 }
 
 sub on_delete_hook {
@@ -325,6 +327,8 @@ sub on_delete_hook {
     return if defined($scfg->{monhost}); # nothing to do if not pve managed ceph
 
     PVE::CephConfig::ceph_remove_keyfile($scfg->{type}, $storeid);
+
+    return;
 }
 
 sub parse_volname {
diff --git a/PVE/Storage/ZFSPoolPlugin.pm b/PVE/Storage/ZFSPoolPlugin.pm
index 2f0a80a..3054331 100644
--- a/PVE/Storage/ZFSPoolPlugin.pm
+++ b/PVE/Storage/ZFSPoolPlugin.pm
@@ -133,6 +133,8 @@ sub on_add_hook {
     } else {
 	$scfg->{mountpoint} = $mountpoint;
     }
+
+    return;
 }
 
 sub path {