diff --git a/llvm/lib/ExecutionEngine/Orc/EPCGenericJITLinkMemoryManager.cpp b/llvm/lib/ExecutionEngine/Orc/EPCGenericJITLinkMemoryManager.cpp
index 2925660207b39d..012ff73fc8e5b3 100644
--- a/llvm/lib/ExecutionEngine/Orc/EPCGenericJITLinkMemoryManager.cpp
+++ b/llvm/lib/ExecutionEngine/Orc/EPCGenericJITLinkMemoryManager.cpp
@@ -9,6 +9,8 @@
 #include "llvm/ExecutionEngine/Orc/EPCGenericJITLinkMemoryManager.h"
 #include "llvm/ExecutionEngine/Orc/LookupAndRecordAddrs.h"
 
+#include <limits>
+
 namespace llvm {
 namespace orc {
 
@@ -32,7 +34,8 @@ class EPCGenericJITLinkMemoryManager::Alloc
   MutableArrayRef<char> getWorkingMemory(ProtectionFlags Seg) override {
     auto I = Segs.find(Seg);
     assert(I != Segs.end() && "No allocation for seg");
-    return {I->second.WorkingMem, I->second.ContentSize};
+    assert(I->second.ContentSize <= std::numeric_limits<size_t>::max());
+    return {I->second.WorkingMem, static_cast<size_t>(I->second.ContentSize)};
   }
 
   JITTargetAddress getTargetMemory(ProtectionFlags Seg) override {
@@ -45,13 +48,14 @@ class EPCGenericJITLinkMemoryManager::Alloc
     char *WorkingMem = WorkingBuffer.get();
     tpctypes::FinalizeRequest FR;
     for (auto &KV : Segs) {
+      assert(KV.second.ContentSize <= std::numeric_limits<size_t>::max());
       FR.push_back(tpctypes::SegFinalizeRequest{
           tpctypes::toWireProtectionFlags(
               static_cast<sys::Memory::ProtectionFlags>(KV.first)),
           KV.second.TargetAddr,
           alignTo(KV.second.ContentSize + KV.second.ZeroFillSize,
                   Parent.EPC.getPageSize()),
-          {WorkingMem, KV.second.ContentSize}});
+          {WorkingMem, static_cast<size_t>(KV.second.ContentSize)}});
       WorkingMem += KV.second.ContentSize;
     }
     Parent.EPC.callSPSWrapperAsync<shared::SPSOrcTargetProcessFinalize>(
diff --git a/llvm/unittests/ExecutionEngine/Orc/EPCGenericJITLinkMemoryManagerTest.cpp b/llvm/unittests/ExecutionEngine/Orc/EPCGenericJITLinkMemoryManagerTest.cpp
index 4d9b01b0c2d6df..186aa75b4966c5 100644
--- a/llvm/unittests/ExecutionEngine/Orc/EPCGenericJITLinkMemoryManagerTest.cpp
+++ b/llvm/unittests/ExecutionEngine/Orc/EPCGenericJITLinkMemoryManagerTest.cpp
@@ -13,6 +13,8 @@
 #include "llvm/Support/Memory.h"
 #include "llvm/Testing/Support/Error.h"
 
+#include <limits>
+
 using namespace llvm;
 using namespace llvm::orc;
 using namespace llvm::orc::shared;
@@ -44,8 +46,9 @@ testFinalize(const char *ArgData, size_t ArgSize) {
                  memcpy(Mem, Seg.Content.data(), Seg.Content.size());
                  memset(Mem + Seg.Content.size(), 0,
                         Seg.Size - Seg.Content.size());
+                 assert(Seg.Size <= std::numeric_limits<size_t>::max());
                  if (auto EC = sys::Memory::protectMappedMemory(
-                         {Mem, Seg.Size},
+                         {Mem, static_cast<size_t>(Seg.Size)},
                          tpctypes::fromWireProtectionFlags(Seg.Prot)))
                    return errorCodeToError(EC);
                  if (Seg.Prot & tpctypes::WPF_Exec)