diff --git a/llvm/lib/BinaryFormat/Magic.cpp b/llvm/lib/BinaryFormat/Magic.cpp
--- a/llvm/lib/BinaryFormat/Magic.cpp
+++ b/llvm/lib/BinaryFormat/Magic.cpp
@@ -88,7 +88,10 @@
     if (startswith(Magic, "!<arch>\n") || startswith(Magic, "!<thin>\n"))
       return file_magic::archive;
     break;
-
+  case '<':
+    if (startswith(Magic, "<bigaf>\n"))
+      return file_magic::archive;
+    break;
   case '\177':
     if (startswith(Magic, "\177ELF") && Magic.size() >= 18) {
       bool Data2MSB = Magic[5] == 2;
diff --git a/llvm/unittests/BinaryFormat/TestFileMagic.cpp b/llvm/unittests/BinaryFormat/TestFileMagic.cpp
--- a/llvm/unittests/BinaryFormat/TestFileMagic.cpp
+++ b/llvm/unittests/BinaryFormat/TestFileMagic.cpp
@@ -46,6 +46,7 @@
 };
 
 const char archive[] = "!<arch>\x0A";
+const char big_archive[] = "<bigaf>\x0A";
 const char bitcode[] = "\xde\xc0\x17\x0b";
 const char coff_object[] = "\x00\x00......";
 const char coff_bigobj[] =
@@ -96,6 +97,7 @@
   } types[] = {
 #define DEFINE(magic) {#magic, magic, sizeof(magic), file_magic::magic}
       DEFINE(archive),
+      {"big_archive", big_archive, sizeof(big_archive), file_magic::archive},
       DEFINE(bitcode),
       DEFINE(coff_object),
       {"coff_bigobj", coff_bigobj, sizeof(coff_bigobj),