diff --git a/data/PVE/SectionConfig.pm b/data/PVE/SectionConfig.pm
index c338a93..f0bf23f 100644
--- a/data/PVE/SectionConfig.pm
+++ b/data/PVE/SectionConfig.pm
@@ -428,9 +428,7 @@ sub write_config {
 sub assert_if_modified {
     my ($cfg, $digest) = @_;
 
-    if ($digest && ($cfg->{digest} ne $digest)) {
-	die "detected modified configuration - file change by other user? Try again.\n";
-    }
+    PVE::Tools::assert_if_modified($cfg->{digest}, $digest);
 }
 
 1;
diff --git a/data/PVE/Tools.pm b/data/PVE/Tools.pm
index 622f8ad..7448183 100644
--- a/data/PVE/Tools.pm
+++ b/data/PVE/Tools.pm
@@ -998,4 +998,12 @@ sub dir_glob_foreach {
     } 
 }
 
+sub assert_if_modified {
+    my ($digest1, $digest2) = @_;
+
+    if ($digest1 && $digest2 && ($digest1 ne $digest2)) {
+	die "detected modified configuration - file change by other user? Try again.\n";
+    }
+}
+
 1;