diff --git a/folly/debugging/symbolizer/Elf.h b/folly/debugging/symbolizer/Elf.h
index 986f2f3d5b4..67f692fc740 100644
--- a/folly/debugging/symbolizer/Elf.h
+++ b/folly/debugging/symbolizer/Elf.h
@@ -54,6 +54,7 @@ using ElfShdr = FOLLY_ELF_ELFW(Shdr);
 using ElfSym = FOLLY_ELF_ELFW(Sym);
 using ElfRel = FOLLY_ELF_ELFW(Rel);
 using ElfRela = FOLLY_ELF_ELFW(Rela);
+using ElfDyn = FOLLY_ELF_ELFW(Dyn);
 
 // ElfFileId is supposed to uniquely identify any instance of an ELF binary.
 // It does that by using the file's inode, dev ID, size and modification time