diff --git a/lld/COFF/Driver.cpp b/lld/COFF/Driver.cpp
index 01bdadd70669..6d9fe243b0ff 100644
--- a/lld/COFF/Driver.cpp
+++ b/lld/COFF/Driver.cpp
@@ -273,7 +273,7 @@ void LinkerDriver::enqueueArchiveMember(const Archive::Child &c,
 
   auto reportBufferError = [=](Error &&e, StringRef childName) {
     fatal("could not get the buffer for the member defining symbol " +
-          toString(sym) + ": " + parentName + "(" + childName + "): " +
+          toCOFFString(sym) + ": " + parentName + "(" + childName + "): " +
           toString(std::move(e)));
   };
 
@@ -284,7 +284,8 @@ void LinkerDriver::enqueueArchiveMember(const Archive::Child &c,
       reportBufferError(mbOrErr.takeError(), check(c.getFullName()));
     MemoryBufferRef mb = mbOrErr.get();
     enqueueTask([=]() {
-      driver->addArchiveBuffer(mb, toString(sym), parentName, offsetInArchive);
+      driver->addArchiveBuffer(mb, toCOFFString(sym), parentName,
+                               offsetInArchive);
     });
     return;
   }
@@ -292,7 +293,7 @@ void LinkerDriver::enqueueArchiveMember(const Archive::Child &c,
   std::string childName = CHECK(
       c.getFullName(),
       "could not get the filename for the member defining symbol " +
-      toString(sym));
+      toCOFFString(sym));
   auto future = std::make_shared<std::future<MBErrPair>>(
       createFutureForFile(childName));
   enqueueTask([=]() {
@@ -300,7 +301,8 @@ void LinkerDriver::enqueueArchiveMember(const Archive::Child &c,
     if (mbOrErr.second)
       reportBufferError(errorCodeToError(mbOrErr.second), childName);
     driver->addArchiveBuffer(takeBuffer(std::move(mbOrErr.first)),
-                             toString(sym), parentName, /*OffsetInArchive=*/0);
+                             toCOFFString(sym), parentName,
+                             /*OffsetInArchive=*/0);
   });
 }
 
diff --git a/lld/COFF/InputFiles.cpp b/lld/COFF/InputFiles.cpp
index c72fa587a026..d02fedfd178b 100644
--- a/lld/COFF/InputFiles.cpp
+++ b/lld/COFF/InputFiles.cpp
@@ -86,8 +86,9 @@ void ArchiveFile::parse() {
 
 // Returns a buffer pointing to a member file containing a given symbol.
 void ArchiveFile::addMember(const Archive::Symbol &sym) {
-  const Archive::Child &c = CHECK(
-      sym.getMember(), "could not get the member for symbol " + toString(sym));
+  const Archive::Child &c =
+      CHECK(sym.getMember(),
+            "could not get the member for symbol " + toCOFFString(sym));
 
   // Return an empty buffer if we have already returned the same buffer.
   if (!seen.insert(c.getChildOffset()).second)
diff --git a/lld/COFF/Symbols.cpp b/lld/COFF/Symbols.cpp
index c1eb75ff7001..acb3b32203e5 100644
--- a/lld/COFF/Symbols.cpp
+++ b/lld/COFF/Symbols.cpp
@@ -33,7 +33,9 @@ static std::string demangle(StringRef symName) {
   return symName;
 }
 std::string toString(coff::Symbol &b) { return demangle(b.getName()); }
-std::string toString(const Archive::Symbol &b) { return demangle(b.getName()); }
+std::string toCOFFString(const Archive::Symbol &b) {
+  return demangle(b.getName());
+}
 
 namespace coff {
 
diff --git a/lld/COFF/Symbols.h b/lld/COFF/Symbols.h
index 77ae2f157d34..10d2b8149cd8 100644
--- a/lld/COFF/Symbols.h
+++ b/lld/COFF/Symbols.h
@@ -21,6 +21,14 @@
 #include <vector>
 
 namespace lld {
+
+std::string toString(coff::Symbol &b);
+
+// There are two different ways to convert an Archive::Symbol to a string:
+// One for Microsoft name mangling and one for Itanium name mangling.
+// Call the functions toCOFFString and toELFString, not just toString.
+std::string toCOFFString(const coff::Archive::Symbol &b);
+
 namespace coff {
 
 using llvm::object::Archive;
@@ -429,8 +437,6 @@ void replaceSymbol(Symbol *s, ArgT &&... arg) {
 }
 } // namespace coff
 
-std::string toString(coff::Symbol &b);
-std::string toString(const coff::Archive::Symbol &b);
 } // namespace lld
 
 #endif
diff --git a/lld/ELF/InputFiles.cpp b/lld/ELF/InputFiles.cpp
index eeb5845b85c6..95a4de33cda8 100644
--- a/lld/ELF/InputFiles.cpp
+++ b/lld/ELF/InputFiles.cpp
@@ -1148,7 +1148,7 @@ void ArchiveFile::fetch(const Archive::Symbol &sym) {
   Archive::Child c =
       CHECK(sym.getMember(), toString(this) +
                                  ": could not get the member for symbol " +
-                                 sym.getName());
+                                 toELFString(sym));
 
   if (!seen.insert(c.getChildOffset()).second)
     return;
@@ -1157,7 +1157,7 @@ void ArchiveFile::fetch(const Archive::Symbol &sym) {
       CHECK(c.getMemoryBufferRef(),
             toString(this) +
                 ": could not get the buffer for the member defining symbol " +
-                sym.getName());
+                toELFString(sym));
 
   if (tar && c.getParent()->isThin())
     tar->append(relativeToRoot(CHECK(c.getFullName(), this)), mb.getBuffer());
diff --git a/lld/ELF/Symbols.cpp b/lld/ELF/Symbols.cpp
index 62c552e04828..22677303c322 100644
--- a/lld/ELF/Symbols.cpp
+++ b/lld/ELF/Symbols.cpp
@@ -42,6 +42,20 @@ Defined *ElfSym::relaIpltEnd;
 Defined *ElfSym::riscvGlobalPointer;
 Defined *ElfSym::tlsModuleBase;
 
+// Returns a symbol for an error message.
+static std::string demangle(StringRef symName) {
+  if (config->demangle)
+    if (Optional<std::string> s = demangleItanium(symName))
+      return *s;
+  return symName;
+}
+namespace lld {
+std::string toString(const Symbol &b) { return demangle(b.getName()); }
+std::string toELFString(const Archive::Symbol &b) {
+  return demangle(b.getName());
+}
+} // namespace lld
+
 static uint64_t getSymVA(const Symbol &sym, int64_t &addend) {
   switch (sym.kind()) {
   case Symbol::DefinedKind: {
@@ -250,12 +264,13 @@ void Symbol::fetch() const {
 }
 
 MemoryBufferRef LazyArchive::getMemberBuffer() {
-  Archive::Child c = CHECK(
-      sym.getMember(), "could not get the member for symbol " + sym.getName());
+  Archive::Child c =
+      CHECK(sym.getMember(),
+            "could not get the member for symbol " + toELFString(sym));
 
   return CHECK(c.getMemoryBufferRef(),
                "could not get the buffer for the member defining symbol " +
-                   sym.getName());
+                   toELFString(sym));
 }
 
 uint8_t Symbol::computeBinding() const {
@@ -331,14 +346,6 @@ void elf::maybeWarnUnorderableSymbol(const Symbol *sym) {
     report(": unable to order discarded symbol: ");
 }
 
-// Returns a symbol for an error message.
-std::string lld::toString(const Symbol &b) {
-  if (config->demangle)
-    if (Optional<std::string> s = demangleItanium(b.getName()))
-      return *s;
-  return b.getName();
-}
-
 static uint8_t getMinVisibility(uint8_t va, uint8_t vb) {
   if (va == STV_DEFAULT)
     return vb;
diff --git a/lld/ELF/Symbols.h b/lld/ELF/Symbols.h
index d640495b0e01..9c1eb387c2f4 100644
--- a/lld/ELF/Symbols.h
+++ b/lld/ELF/Symbols.h
@@ -33,7 +33,11 @@ class Undefined;
 } // namespace elf
 
 std::string toString(const elf::Symbol &);
-std::string toString(const elf::InputFile *);
+
+// There are two different ways to convert an Archive::Symbol to a string:
+// One for Microsoft name mangling and one for Itanium name mangling.
+// Call the functions toCOFFString and toELFString, not just toString.
+std::string toELFString(const elf::Archive::Symbol &);
 
 namespace elf {
 
diff --git a/lld/test/ELF/archive-thin-missing-member.s b/lld/test/ELF/archive-thin-missing-member.s
index d96fbc45415b..4db1376cfaf2 100644
--- a/lld/test/ELF/archive-thin-missing-member.s
+++ b/lld/test/ELF/archive-thin-missing-member.s
@@ -8,17 +8,19 @@
 # RUN: rm %t.o
 
 # Test error when loading symbols from missing thin archive member.
-# RUN: not ld.lld %t-no-syms.a -o /dev/null 2>&1 | FileCheck %s --check-prefix=ERR1
+# RUN: not ld.lld --entry=_Z1fi %t-no-syms.a -o /dev/null 2>&1 | FileCheck %s --check-prefix=ERR1
 # ERR1: {{.*}}-no-syms.a: could not get the buffer for a child of the archive: '{{.*}}.o': {{[Nn]}}o such file or directory
 
 # Test error when thin archive has symbol table but member is missing.
-# RUN: not ld.lld -m elf_amd64_fbsd %t-syms.a -o /dev/null 2>&1 | FileCheck %s --check-prefix=ERR2
-# ERR2: {{.*}}-syms.a: could not get the buffer for the member defining symbol _start: '{{.*}}.o': {{[Nn]}}o such file or directory
+# RUN: not ld.lld --entry=_Z1fi -m elf_amd64_fbsd %t-syms.a -o /dev/null 2>&1 | FileCheck %s --check-prefix=ERR2
+# ERR2: {{.*}}-syms.a: could not get the buffer for the member defining symbol f(int): '{{.*}}.o': {{[Nn]}}o such file or directory
+# RUN: not ld.lld --entry=_Z1fi --no-demangle -m elf_amd64_fbsd %t-syms.a -o /dev/null 2>&1 | FileCheck %s --check-prefix=ERR2MANGLE
+# ERR2MANGLE: {{.*}}-syms.a: could not get the buffer for the member defining symbol _Z1fi: '{{.*}}.o': {{[Nn]}}o such file or directory
 
 # Test error when thin archive is linked using --whole-archive but member is missing.
-# RUN: not ld.lld --whole-archive %t-syms.a -o /dev/null 2>&1 | FileCheck %s --check-prefix=ERR3
+# RUN: not ld.lld --entry=_Z1fi --whole-archive %t-syms.a -o /dev/null 2>&1 | FileCheck %s --check-prefix=ERR3
 # ERR3: {{.*}}-syms.a: could not get the buffer for a child of the archive: '{{.*}}.o': {{[Nn]}}o such file or directory
 
-.global _start
-_start:
+.global _Z1fi
+_Z1fi:
     nop