diff --git a/src/backend/cpu/CpuWorker.cpp b/src/backend/cpu/CpuWorker.cpp
index aed79190..6263f89a 100644
--- a/src/backend/cpu/CpuWorker.cpp
+++ b/src/backend/cpu/CpuWorker.cpp
@@ -86,7 +86,9 @@ xmrig::CpuWorker<N>::CpuWorker(size_t id, const CpuLaunchData &data) :
     if ((N == 1) && (m_av == CnHash::AV_SINGLE) && (m_algorithm.family() == Algorithm::CN_HEAVY) && (m_assembly != Assembly::NONE) && (Cpu::info()->arch() == ICpuInfo::ARCH_ZEN3)) {
         std::lock_guard<std::mutex> lock(cn_heavyZen3MemoryMutex);
         if (!cn_heavyZen3Memory) {
-            cn_heavyZen3Memory = new VirtualMemory(m_algorithm.l3() * m_threads, data.hugePages, false, false, node());
+            // Round up number of threads to the multiple of 8
+            const size_t N = ((m_threads + 7) / 8) * 8;
+            cn_heavyZen3Memory = new VirtualMemory(m_algorithm.l3() * N, data.hugePages, false, false, node());
         }
         m_memory = cn_heavyZen3Memory;
     }