diff --git a/extensions/standards/HBM3/DRAMSys/configuration/memspec/MemSpecHBM3.cpp b/extensions/standards/HBM3/DRAMSys/configuration/memspec/MemSpecHBM3.cpp
index 24c0c8b2..8f14b1cb 100644
--- a/extensions/standards/HBM3/DRAMSys/configuration/memspec/MemSpecHBM3.cpp
+++ b/extensions/standards/HBM3/DRAMSys/configuration/memspec/MemSpecHBM3.cpp
@@ -80,7 +80,7 @@ MemSpecHBM3::MemSpecHBM3(const DRAMUtils::MemSpec::MemSpecHBM3& 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;