diff --git a/lld/MachO/InputSection.h b/lld/MachO/InputSection.h
--- a/lld/MachO/InputSection.h
+++ b/lld/MachO/InputSection.h
@@ -87,7 +87,7 @@
          llvm::MachO::S_ATTR_DEBUG;
 }
 
-bool isCodeSection(InputSection *);
+bool isCodeSection(const InputSection *);
 
 extern std::vector<InputSection *> inputSections;
 
diff --git a/lld/MachO/InputSection.cpp b/lld/MachO/InputSection.cpp
--- a/lld/MachO/InputSection.cpp
+++ b/lld/MachO/InputSection.cpp
@@ -91,7 +91,7 @@
   }
 }
 
-bool macho::isCodeSection(InputSection *isec) {
+bool macho::isCodeSection(const InputSection *isec) {
   uint32_t type = isec->flags & SECTION_TYPE;
   if (type != S_REGULAR && type != S_COALESCED)
     return false;