diff --git a/lld/COFF/Config.h b/lld/COFF/Config.h
--- a/lld/COFF/Config.h
+++ b/lld/COFF/Config.h
@@ -289,6 +289,7 @@
   bool autoImport = false;
   bool pseudoRelocs = false;
   bool stdcallFixup = false;
+  bool writeCheckSum = false;
 };
 
 extern std::unique_ptr<Configuration> config;
diff --git a/lld/COFF/Driver.cpp b/lld/COFF/Driver.cpp
--- a/lld/COFF/Driver.cpp
+++ b/lld/COFF/Driver.cpp
@@ -432,6 +432,10 @@
       }
       break;
     }
+    case OPT_release: {
+      config->writeCheckSum = true;
+      break;
+    }
     // Only add flags here that link.exe accepts in
     // `#pragma comment(linker, "/flag")`-generated sections.
     case OPT_editandcontinue:
@@ -2020,6 +2024,10 @@
   if (errorCount())
     return;
 
+  // Handle /RELEASE
+  if (args.hasArg(OPT_release))
+    config->writeCheckSum = true;
+  
   // Handle /safeseh, x86 only, on by default, except for mingw.
   if (config->machine == I386) {
     config->safeSEH = args.hasFlag(OPT_safeseh, OPT_safeseh_no, !config->mingw);
diff --git a/lld/COFF/Options.td b/lld/COFF/Options.td
--- a/lld/COFF/Options.td
+++ b/lld/COFF/Options.td
@@ -161,6 +161,8 @@
 def verbose : F<"verbose">;
 def wholearchive_flag : F<"wholearchive">,
     HelpText<"Include all object files from all libraries">;
+def release : F<"release">,
+    HelpText<"Set the Checksum in the header of an PE file">;
 
 def force : F<"force">,
     HelpText<"Allow undefined and multiply defined symbols">;
diff --git a/lld/COFF/Writer.cpp b/lld/COFF/Writer.cpp
--- a/lld/COFF/Writer.cpp
+++ b/lld/COFF/Writer.cpp
@@ -230,6 +230,7 @@
   void setSectionPermissions();
   void writeSections();
   void writeBuildId();
+  void writePEChecksum();
   void sortSections();
   void sortExceptionTable();
   void sortCRTSectionChunks(std::vector<Chunk *> &chunks);
@@ -599,6 +600,54 @@
   }
 }
 
+void Writer::writePEChecksum() {
+  if (!config->writeCheckSum) {
+    return;
+  }
+
+  // https://docs.microsoft.com/en-us/windows/win32/debug/pe-format#checksum
+  uint32_t checkSum = 0;
+  uint32_t *buf = (uint32_t *)buffer->getBufferStart();
+  uint32_t size = (uint32_t)(buffer->getBufferSize());
+
+  coff_file_header *coffHeader =
+      (coff_file_header *)((uint8_t *)buf + dosStubSize + sizeof(PEMagic));
+  pe32_header *peHeader =
+      (pe32_header *)((uint8_t *)coffHeader + sizeof(coff_file_header));
+  uint32_t oldCheckSum = peHeader->CheckSum;
+
+  auto CalcCheckSum = [](uint32_t StartValue, void *BaseAddress,
+                         uint32_t WordCount) -> uint16_t {
+    uint16_t *p = (uint16_t *)BaseAddress;
+    uint32_t sum = StartValue;
+    for (uint32_t i = 0; i < WordCount; i++) {
+      sum += *p;
+      if (((sum >> 16) & 0xffff) != 0) {
+        sum = (sum & 0xffff) + ((sum >> 16) & 0xffff);
+      }
+      p++;
+    }
+    return (uint16_t)((sum & 0xffff) + ((sum >> 16) & 0xffff));
+  };
+
+  checkSum = CalcCheckSum(0, buf, (size + 1) / sizeof(uint16_t));
+  if ((checkSum & 0xffff) >= (oldCheckSum & 0xffff)) {
+    checkSum -= (oldCheckSum & 0xffff);
+  } else {
+    checkSum = (((checkSum & 0xffff) - (oldCheckSum & 0xffff)) & 0xFFFF) - 1;
+  }
+
+  if ((checkSum & 0xffff) >= ((oldCheckSum >> 16) & 0xffff)) {
+    checkSum -= ((oldCheckSum >> 16) & 0xffff);
+  } else {
+    checkSum =
+        (((checkSum & 0xffff) - ((oldCheckSum >> 16) & 0xffff)) & 0xFFFF) - 1;
+  }
+
+  checkSum += size;
+  peHeader->CheckSum = checkSum;
+}
+
 // The main function of the writer.
 void Writer::run() {
   ScopedTimer t1(ctx.codeLayoutTimer);
@@ -647,6 +696,8 @@
   writeLLDMapFile(ctx);
   writeMapFile(ctx);
 
+  writePEChecksum();
+
   if (errorCount())
     return;