diff --git a/PVE/QemuServer.pm b/PVE/QemuServer.pm
index a498444b..0026c8d9 100644
--- a/PVE/QemuServer.pm
+++ b/PVE/QemuServer.pm
@@ -2215,6 +2215,8 @@ sub parse_vm_config {
 
 		$conf->{$key} = $value;
 	    }
+	} else {
+	    warn "vm $vmid - unable to parse config: $line\n";
 	}
     }