diff --git a/llvm/lib/Object/MachOObjectFile.cpp b/llvm/lib/Object/MachOObjectFile.cpp
--- a/llvm/lib/Object/MachOObjectFile.cpp
+++ b/llvm/lib/Object/MachOObjectFile.cpp
@@ -2997,7 +2997,9 @@
         return;
       }
       if (O != nullptr) {
-        if (State.Other > O->getLibraryCount()) {
+        // Only positive numbers represent library ordinals. Zero and negative
+        // numbers have special meaning (see BindSpecialDylib).
+        if ((int64_t)State.Other > 0 && State.Other > O->getLibraryCount()) {
           *E = malformedError(
               "bad library ordinal: " + Twine((int)State.Other) + " (max " +
               Twine((int)O->getLibraryCount()) +
diff --git a/llvm/test/Object/AArch64/nm-flat-reexport.test b/llvm/test/Object/AArch64/nm-flat-reexport.test
new file mode 100644
--- /dev/null
+++ b/llvm/test/Object/AArch64/nm-flat-reexport.test
@@ -0,0 +1,7 @@
+RUN: rm -rf %t && mkdir -p %t
+RUN: yaml2obj %p/../Inputs/MachO/flat-reexport.yaml -o %t/flat-reexport
+RUN: llvm-nm --dyldinfo-only %t/flat-reexport | FileCheck %s
+
+CHECK-NOT: error
+CHECK: _fputc
+CHECK: _sym1
\ No newline at end of file
diff --git a/llvm/test/Object/Inputs/MachO/flat-reexport.yaml b/llvm/test/Object/Inputs/MachO/flat-reexport.yaml
new file mode 100644
--- /dev/null
+++ b/llvm/test/Object/Inputs/MachO/flat-reexport.yaml
@@ -0,0 +1,148 @@
+# echo "_fputc" >> reexports.exp
+# echo "void sym1(void){}" | xcrun clang --target=arm64-apple-macos11.0 -o flat-reexport -dynamiclib -Wl,-reexported_symbols_list,reexports.exp -Wl,-flat_namespace -x c -
+# obj2yaml --raw-segment=data --raw-segment=linkedit flat-reexport > flat-reexport.yaml
+--- !mach-o
+FileHeader:
+  magic:           0xFEEDFACF
+  cputype:         0x100000C
+  cpusubtype:      0x0
+  filetype:        0x6
+  ncmds:           13
+  sizeofcmds:      672
+  flags:           0x108004
+  reserved:        0x0
+LoadCommands:
+  - cmd:             LC_SEGMENT_64
+    cmdsize:         232
+    segname:         __TEXT
+    vmaddr:          0
+    vmsize:          16384
+    fileoff:         0
+    filesize:        16384
+    maxprot:         5
+    initprot:        5
+    nsects:          2
+    flags:           0
+    Sections:
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+        segname:         __TEXT
+        addr:            0x3FB4
+        size:            4
+        offset:          0x3FB4
+        align:           2
+        reloff:          0x0
+        nreloc:          0
+        flags:           0x80000400
+        reserved1:       0x0
+        reserved2:       0x0
+        reserved3:       0x0
+        content:         C0035FD6
+      - sectname:        __unwind_info
+        segname:         __TEXT
+        addr:            0x3FB8
+        size:            72
+        offset:          0x3FB8
+        align:           2
+        reloff:          0x0
+        nreloc:          0
+        flags:           0x0
+        reserved1:       0x0
+        reserved2:       0x0
+        reserved3:       0x0
+        content:         010000001C000000000000001C000000000000001C00000002000000B43F00003400000034000000B93F00000000000034000000030000000C000100100001000000000000000002
+  - cmd:             LC_SEGMENT_64
+    cmdsize:         72
+    segname:         __LINKEDIT
+    vmaddr:          16384
+    vmsize:          16384
+    fileoff:         16384
+    filesize:        442
+    maxprot:         1
+    initprot:        1
+    nsects:          0
+    flags:           0
+  - cmd:             LC_ID_DYLIB
+    cmdsize:         40
+    dylib:
+      name:            24
+      timestamp:       1
+      current_version: 0
+      compatibility_version: 0
+    Content:         flat-reexport
+    ZeroPadBytes:    3
+  - cmd:             LC_DYLD_INFO_ONLY
+    cmdsize:         48
+    rebase_off:      0
+    rebase_size:     0
+    bind_off:        0
+    bind_size:       0
+    weak_bind_off:   0
+    weak_bind_size:  0
+    lazy_bind_off:   0
+    lazy_bind_size:  0
+    export_off:      16384
+    export_size:     40
+  - cmd:             LC_SYMTAB
+    cmdsize:         24
+    symoff:          16432
+    nsyms:           4
+    stroff:          16496
+    strsize:         40
+  - cmd:             LC_DYSYMTAB
+    cmdsize:         80
+    ilocalsym:       0
+    nlocalsym:       0
+    iextdefsym:      0
+    nextdefsym:      2
+    iundefsym:       2
+    nundefsym:       2
+    tocoff:          0
+    ntoc:            0
+    modtaboff:       0
+    nmodtab:         0
+    extrefsymoff:    0
+    nextrefsyms:     0
+    indirectsymoff:  0
+    nindirectsyms:   0
+    extreloff:       0
+    nextrel:         0
+    locreloff:       0
+    nlocrel:         0
+  - cmd:             LC_UUID
+    cmdsize:         24
+    uuid:            840B0A4F-3749-37F1-B52C-37DC65AAA0DB
+  - cmd:             LC_BUILD_VERSION
+    cmdsize:         32
+    platform:        1
+    minos:           720896
+    sdk:             787712
+    ntools:          1
+    Tools:
+      - tool:            3
+        version:         53280768
+  - cmd:             LC_SOURCE_VERSION
+    cmdsize:         16
+    version:         0
+  - cmd:             LC_LOAD_DYLIB
+    cmdsize:         56
+    dylib:
+      name:            24
+      timestamp:       2
+      current_version: 85948417
+      compatibility_version: 65536
+    Content:         '/usr/lib/libSystem.B.dylib'
+    ZeroPadBytes:    6
+  - cmd:             LC_FUNCTION_STARTS
+    cmdsize:         16
+    dataoff:         16424
+    datasize:        8
+  - cmd:             LC_DATA_IN_CODE
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
+...