diff --git a/src/libdramsys/DRAMSys/configuration/memspec/MemSpecHBM2.cpp b/src/libdramsys/DRAMSys/configuration/memspec/MemSpecHBM2.cpp
index b845667c..ba499f7d 100644
--- a/src/libdramsys/DRAMSys/configuration/memspec/MemSpecHBM2.cpp
+++ b/src/libdramsys/DRAMSys/configuration/memspec/MemSpecHBM2.cpp
@@ -97,7 +97,7 @@ MemSpecHBM2::MemSpecHBM2(const DRAMUtils::MemSpec::MemSpecHBM2& memSpec) :
     uint64_t deviceSizeBits =
         static_cast<uint64_t>(banksPerRank) * rowsPerBank * columnsPerRow * bitWidth;
     uint64_t deviceSizeBytes = deviceSizeBits / 8;
-    memorySizeBytes = deviceSizeBytes * ranksPerChannel * numberOfChannels;
+    memorySizeBytes = deviceSizeBytes * ranksPerChannel * stacksPerChannel * numberOfChannels;
 
     std::cout << headline << std::endl;
     std::cout << "Memory Configuration:" << std::endl << std::endl;