diff --git a/src/cmd/link/internal/arm64/asm.go b/src/cmd/link/internal/arm64/asm.go
index b2572fd1040..8d8ea8ac542 100644
--- a/src/cmd/link/internal/arm64/asm.go
+++ b/src/cmd/link/internal/arm64/asm.go
@@ -224,6 +224,28 @@ func adddynrel(target *ld.Target, ldr *loader.Loader, syms *ld.ArchSyms, s loade
 		}
 		return true
 
+	case objabi.MachoRelocOffset + ld.MACHO_ARM64_RELOC_SUBTRACTOR*2:
+		// ARM64_RELOC_SUBTRACTOR must be followed by ARM64_RELOC_UNSIGNED.
+		// The pair of relocations resolves to the difference between two
+		// symbol addresses (each relocation specifies a symbol).
+		outer, off := ld.FoldSubSymbolOffset(ldr, targ)
+		if outer != s {
+			// TODO: support subtracted symbol in different section.
+			ldr.Errorf(s, "unsupported ARM64_RELOC_SUBTRACTOR reloc: target %s, outer %s", ldr.SymName(targ), ldr.SymName(outer))
+			break
+		}
+		su := ldr.MakeSymbolUpdater(s)
+		relocs := su.Relocs()
+		if rIdx+1 >= relocs.Count() || relocs.At(rIdx+1).Type() != objabi.MachoRelocOffset+ld.MACHO_ARM64_RELOC_UNSIGNED*2 || relocs.At(rIdx+1).Off() != r.Off() {
+			ldr.Errorf(s, "unexpected ARM64_RELOC_SUBTRACTOR reloc, must be followed by ARM64_RELOC_UNSIGNED at same offset")
+			break
+		}
+		su.SetRelocType(rIdx+1, objabi.R_PCREL)
+		su.SetRelocAdd(rIdx+1, r.Add()+int64(r.Off())+int64(r.Siz())-off)
+		// Remove the other relocation
+		su.SetRelocSiz(rIdx, 0)
+		return true
+
 	case objabi.MachoRelocOffset + ld.MACHO_ARM64_RELOC_BRANCH26*2 + pcrel:
 		su := ldr.MakeSymbolUpdater(s)
 		su.SetRelocType(rIdx, objabi.R_CALLARM64)
diff --git a/src/cmd/link/internal/ld/macho.go b/src/cmd/link/internal/ld/macho.go
index 6920f42015b..c2626346661 100644
--- a/src/cmd/link/internal/ld/macho.go
+++ b/src/cmd/link/internal/ld/macho.go
@@ -106,6 +106,7 @@ const (
 	MACHO_ARM_RELOC_SECTDIFF             = 2
 	MACHO_ARM_RELOC_BR24                 = 5
 	MACHO_ARM64_RELOC_UNSIGNED           = 0
+	MACHO_ARM64_RELOC_SUBTRACTOR         = 1
 	MACHO_ARM64_RELOC_BRANCH26           = 2
 	MACHO_ARM64_RELOC_PAGE21             = 3
 	MACHO_ARM64_RELOC_PAGEOFF12          = 4