diff --git a/lld/ELF/ADLTSection.h b/lld/ELF/ADLTSection.h
index b4ba5966741d9d58326a2b77426d4e3b0556fee4..3441ddb8af2947da4b3cac8ec5b44d0a74f87184 100644
--- a/lld/ELF/ADLTSection.h
+++ b/lld/ELF/ADLTSection.h
@@ -102,6 +102,7 @@ typedef struct {
   adlt_hash_type_t  stringHashType; // contains adlt_hash_type_enum_t value
   Elf64_Off     blobStart; // offset of binary blob start relative to .adlt
   Elf64_Xword   blobSize;
+  Elf64_Xword   overallMappedSize;  // bytes, required to map the whole ADLT image
 } adlt_section_header_t;
 
 static const char adltBlobStartMark[4] = { 0xA, 0xD, 0x1, 0x7 };
diff --git a/lld/ELF/SyntheticSections.cpp b/lld/ELF/SyntheticSections.cpp
index 6ac5296c1530bb36f815c2b03b1f0c2032c6b68b..8f51cc9600a61cfa71fd8f32ee0618613e2289be 100644
--- a/lld/ELF/SyntheticSections.cpp
+++ b/lld/ELF/SyntheticSections.cpp
@@ -4020,8 +4020,8 @@ static_assert(sizeof(adltBlobStartMark) == 4,
   "0xad17 consist of 4 bytes"
 );
 
-static_assert(sizeof(adlt_section_header_t) == 32,
-  "please udpate major version if header has been changed"
+static_assert(sizeof(adlt_section_header_t) == 40,
+  "please udpate version if header has been changed"
 );
 
 static_assert(sizeof(adlt_psod_t) == 128,
@@ -4058,8 +4058,11 @@ void AdltSection<ELFT>::finalizeContents() {
     ADLT_HASH_TYPE_GNU_HASH,        // .stringHashType
     getBlobStartOffset(),           // .blobStart
     estimateBlobSize(),             // .blobSize
+    0,                              // .overallMappedSize
   };
 
+  // TODO: estimate and fill overallMappedSize
+
   buildSonameIndex();
   linkInternalDtNeeded();
   extractInitFiniArray();