Index: llvm/docs/CommandGuide/llvm-objdump.rst
===================================================================
--- llvm/docs/CommandGuide/llvm-objdump.rst
+++ llvm/docs/CommandGuide/llvm-objdump.rst
@@ -316,7 +316,7 @@
 
   Print chained fixup information.
 
-.. option:: --dyld_info
+.. option:: --dyld-info
 
   Print bind and rebase information used by dyld to resolve external
   references in a final linked binary.
Index: llvm/test/Object/AArch64/chained-fixups-header.test
===================================================================
--- llvm/test/Object/AArch64/chained-fixups-header.test
+++ llvm/test/Object/AArch64/chained-fixups-header.test
@@ -1,24 +1,24 @@
 REQUIRES: host-byteorder-little-endian
 RUN: cat %p/../Inputs/MachO/chained-fixups.yaml \
 RUN:   | sed 's/__LINKEDIT:      00000000/__LINKEDIT:      AB000000/' \
-RUN:   | yaml2obj | not llvm-objdump --macho --dyld_info - 2>&1 \
+RUN:   | yaml2obj | not llvm-objdump --macho --dyld-info - 2>&1 \
 RUN:   | FileCheck %s --check-prefix=HEADER1
 HEADER1: truncated or malformed object (bad chained fixups: unknown version: 171)
 
 RUN: cat %p/../Inputs/MachO/chained-fixups.yaml \
 RUN:   | sed 's/1000000010000000/1000000AB0000000/' \
-RUN:   | yaml2obj | not llvm-objdump --macho --dyld_info - 2>&1 \
+RUN:   | yaml2obj | not llvm-objdump --macho --dyld-info - 2>&1 \
 RUN:   | FileCheck %s --check-prefix=HEADER2
 HEADER2: truncated or malformed object (bad chained fixups: unknown imports format: 171)
 
 RUN: cat %p/../Inputs/MachO/chained-fixups.yaml \
 RUN:   | sed 's/20000000/01000000/' \
-RUN:   | yaml2obj | not llvm-objdump --macho --dyld_info - 2>&1 \
+RUN:   | yaml2obj | not llvm-objdump --macho --dyld-info - 2>&1 \
 RUN:   | FileCheck %s --check-prefix=HEADER3
 HEADER3: truncated or malformed object (bad chained fixups: image starts offset 1 overlaps with chained fixups header)
 
 RUN: cat %p/../Inputs/MachO/chained-fixups.yaml \
 RUN:   | sed 's/20000000/FF000000/' \
-RUN:   | yaml2obj | not llvm-objdump --macho --dyld_info - 2>&1 \
+RUN:   | yaml2obj | not llvm-objdump --macho --dyld-info - 2>&1 \
 RUN:   | FileCheck %s --check-prefix=HEADER4
 HEADER4: truncated or malformed object (bad chained fixups: image starts end 33031 extends past end 32856)
Index: llvm/test/tools/llvm-objdump/MachO/dyld-info.test
===================================================================
--- llvm/test/tools/llvm-objdump/MachO/dyld-info.test
+++ llvm/test/tools/llvm-objdump/MachO/dyld-info.test
@@ -1,4 +1,4 @@
-RUN: llvm-objdump --macho --dyld_info %p/Inputs/bind.macho-x86_64 \
+RUN: llvm-objdump --macho --dyld-info %p/Inputs/bind.macho-x86_64 \
 RUN:   | FileCheck %s --match-full-lines --strict-whitespace \
 RUN:     --implicit-check-not={{.}}
 
Index: llvm/tools/llvm-objdump/ObjdumpOpts.td
===================================================================
--- llvm/tools/llvm-objdump/ObjdumpOpts.td
+++ llvm/tools/llvm-objdump/ObjdumpOpts.td
@@ -303,7 +303,7 @@
   HelpText<"Print chained fixup information (requires --macho)">,
   Group<grp_mach_o>;
 
-def dyld_info : Flag<["--"], "dyld_info">,
+def dyld_info : Flag<["--"], "dyld-info">,
   HelpText<"Print bind and rebase information used by dyld to resolve "
            "external references in a final linked binary "
            "(requires --macho)">,