diff --git a/model/Disk.cpp b/model/Disk.cpp
index 1568ba4..b66c336 100644
--- a/model/Disk.cpp
+++ b/model/Disk.cpp
@@ -153,7 +153,7 @@
     return nullptr;
 }
 
-void Disk::listVolumes(VolumeBase::Type type, std::list<std::string>& list) {
+void Disk::listVolumes(VolumeBase::Type type, std::list<std::string>& list) const {
     for (const auto& vol : mVolumes) {
         if (vol->getType() == type) {
             list.push_back(vol->getId());