diff --git a/lld/MachO/ConcatOutputSection.cpp b/lld/MachO/ConcatOutputSection.cpp
index 46cd15a40025db..9f71e81b073a8f 100644
--- a/lld/MachO/ConcatOutputSection.cpp
+++ b/lld/MachO/ConcatOutputSection.cpp
@@ -124,13 +124,13 @@ bool ConcatOutputSection::needsThunks() const {
   if (!target->usesThunks())
     return false;
   uint64_t isecAddr = addr;
-  for (InputSection *isec : inputs)
+  for (ConcatInputSection *isec : inputs)
     isecAddr = alignTo(isecAddr, isec->align) + isec->getSize();
   if (isecAddr - addr + in.stubs->getSize() <=
       std::min(target->backwardBranchRange, target->forwardBranchRange))
     return false;
   // Yes, this program is large enough to need thunks.
-  for (InputSection *isec : inputs) {
+  for (ConcatInputSection *isec : inputs) {
     for (Reloc &r : isec->relocs) {
       if (!target->hasAttr(r.type, RelocAttrBits::BRANCH))
         continue;
@@ -143,9 +143,8 @@ bool ConcatOutputSection::needsThunks() const {
       // might need to create more for this referent at the time we are
       // estimating distance to __stubs in estimateStubsInRangeVA().
       ++thunkInfo.callSiteCount;
-      // Knowing InputSection call site count will help us avoid work on those
-      // that have no BRANCH relocs.
-      ++isec->callSiteCount;
+      // We can avoid work on InputSections that have no BRANCH relocs.
+      isec->hasCallSites = true;
     }
   }
   return true;
@@ -250,7 +249,7 @@ void ConcatOutputSection::finalize() {
                                     isecVA + forwardBranchRange - slop)
       finalizeOne(inputs[finalIdx++]);
 
-    if (isec->callSiteCount == 0)
+    if (!isec->hasCallSites)
       continue;
 
     if (finalIdx == endIdx && stubsInRangeVA == TargetInfo::outOfRangeVA) {
diff --git a/lld/MachO/InputSection.h b/lld/MachO/InputSection.h
index 1183e32fbabf97..fa137223c426fa 100644
--- a/lld/MachO/InputSection.h
+++ b/lld/MachO/InputSection.h
@@ -57,9 +57,8 @@ class InputSection {
   OutputSection *parent = nullptr;
 
   uint32_t align = 1;
-  uint32_t callSiteCount : 31;
   // is address assigned?
-  uint32_t isFinal : 1;
+  bool isFinal = false;
 
   ArrayRef<uint8_t> data;
   std::vector<Reloc> relocs;
@@ -86,12 +85,11 @@ class InputSection {
 
   InputSection(Kind kind, StringRef segname, StringRef name, InputFile *file,
                ArrayRef<uint8_t> data, uint32_t align, uint32_t flags)
-      : align(align), callSiteCount(0), isFinal(false), data(data),
+      : align(align), data(data),
         shared(make<Shared>(file, name, segname, flags, kind)) {}
 
   InputSection(const InputSection &rhs)
-      : align(rhs.align), callSiteCount(0), isFinal(false), data(rhs.data),
-        shared(rhs.shared) {}
+      : align(rhs.align), data(rhs.data), shared(rhs.shared) {}
 
   const Shared *const shared;
 };
@@ -143,6 +141,7 @@ class ConcatInputSection final : public InputSection {
   // first and not copied to the output.
   bool wasCoalesced = false;
   bool live = !config->deadStrip;
+  bool hasCallSites = false;
   // This variable has two usages. Initially, it represents the input order.
   // After assignAddresses is called, it represents the offset from the
   // beginning of the output section this section was assigned to.