diff --git a/test/Object/nm-trivial-object.test b/test/Object/nm-trivial-object.test
index a1b8a30df25..09642e1c688 100644
--- a/test/Object/nm-trivial-object.test
+++ b/test/Object/nm-trivial-object.test
@@ -12,6 +12,8 @@ RUN: llvm-nm %p/Inputs/absolute.elf-x86-64 \
 RUN:         | FileCheck %s -check-prefix ABSOLUTE-ELF64
 RUN: llvm-nm %p/Inputs/trivial-object-test.macho-i386 \
 RUN:         | FileCheck %s -check-prefix macho
+RUN: llvm-nm -U %p/Inputs/trivial-object-test.macho-i386 \
+RUN:         | FileCheck %s -check-prefix macho-U
 RUN: llvm-nm %p/Inputs/trivial-object-test.macho-x86-64 \
 RUN:         | FileCheck %s -check-prefix macho64
 RUN: llvm-nm %p/Inputs/macho-text-data-bss.macho-x86_64 \
@@ -68,6 +70,10 @@ macho:          U _SomeOtherFunction
 macho: 00000000 T _main
 macho:          U _puts
 
+macho-U-NOT:          U _SomeOtherFunction
+macho-U: 00000000 T _main
+macho-U-NOT:          U _puts
+
 macho64: 0000000000000028 s L_.str
 macho64:                  U _SomeOtherFunction
 macho64: 0000000000000000 T _main
diff --git a/tools/llvm-nm/llvm-nm.cpp b/tools/llvm-nm/llvm-nm.cpp
index 64aae5e0c34..0264b708ad6 100644
--- a/tools/llvm-nm/llvm-nm.cpp
+++ b/tools/llvm-nm/llvm-nm.cpp
@@ -73,6 +73,8 @@ cl::alias DynamicSyms2("D", cl::desc("Alias for --dynamic"),
 
 cl::opt<bool> DefinedOnly("defined-only",
                           cl::desc("Show only defined symbols"));
+cl::alias DefinedOnly2("U", cl::desc("Alias for --defined-only"),
+                       cl::aliasopt(DefinedOnly));
 
 cl::opt<bool> ExternalOnly("extern-only",
                            cl::desc("Show only external symbols"));