diff --git a/include/mallocMC/mallocMC_allocator_handle.hpp b/include/mallocMC/mallocMC_allocator_handle.hpp
index 1da222fa..9369f869 100644
--- a/include/mallocMC/mallocMC_allocator_handle.hpp
+++ b/include/mallocMC/mallocMC_allocator_handle.hpp
@@ -44,19 +44,19 @@ namespace mallocMC
         }
 
         template<typename AlpakaAcc>
-        ALPAKA_FN_ACC auto malloc(AlpakaAcc const& acc, size_t size) -> void*
+        ALPAKA_FN_ACC auto malloc(AlpakaAcc const& acc, size_t size) const -> void*
         {
             return devAllocator->malloc(acc, size);
         }
 
         template<typename AlpakaAcc>
-        ALPAKA_FN_ACC void free(AlpakaAcc const& acc, void* p)
+        ALPAKA_FN_ACC void free(AlpakaAcc const& acc, void* p) const
         {
             devAllocator->free(acc, p);
         }
 
         template<typename AlpakaAcc>
-        ALPAKA_FN_ACC auto getAvailableSlots(AlpakaAcc const& acc, size_t slotSize) -> unsigned
+        ALPAKA_FN_ACC auto getAvailableSlots(AlpakaAcc const& acc, size_t slotSize) const -> unsigned
         {
             return devAllocator->getAvailableSlots(acc, slotSize);
         }