Index: lib/ObjectYAML/ELFYAML.cpp
===================================================================
--- lib/ObjectYAML/ELFYAML.cpp
+++ lib/ObjectYAML/ELFYAML.cpp
@@ -542,6 +542,7 @@
     llvm_unreachable("Unsupported architecture");
   }
 #undef ELF_RELOC
+  IO.enumFallback<Hex32>(Value);
 }
 
 void ScalarEnumerationTraits<ELFYAML::MIPS_AFL_REG>::enumeration(
Index: test/Object/X86/yaml-elf-x86-rel-broken.yaml
===================================================================
--- test/Object/X86/yaml-elf-x86-rel-broken.yaml
+++ test/Object/X86/yaml-elf-x86-rel-broken.yaml
@@ -0,0 +1,48 @@
+# RUN: yaml2obj %s > %t
+# RUN: obj2yaml %t | FileCheck %s
+
+# CHECK:      --- !ELF
+# CHECK-NEXT: FileHeader:
+# CHECK-NEXT:   Class:           ELFCLASS32
+# CHECK-NEXT:   Data:            ELFDATA2LSB
+# CHECK-NEXT:   Type:            ET_REL
+# CHECK-NEXT:   Machine:         EM_386
+# CHECK-NEXT: Sections:
+# CHECK-NEXT:   - Name:            .text
+# CHECK-NEXT:     Type:            SHT_PROGBITS
+# CHECK-NEXT:     Flags:           [ SHF_ALLOC, SHF_EXECINSTR ]
+# CHECK-NEXT:     AddressAlign:    0x0000000000000004
+# CHECK-NEXT:     Content:         '0000000000000000'
+# CHECK-NEXT:   - Name:            .rel.text
+# CHECK-NEXT:     Type:            SHT_REL
+# CHECK-NEXT:     Link:            .symtab
+# CHECK-NEXT:     AddressAlign:    0x0000000000000004
+# CHECK-NEXT:     Info:            .text
+# CHECK-NEXT:     Relocations:
+# CHECK-NEXT:       - Offset:          0x0000000000000000
+# CHECK-NEXT:         Symbol:          ''
+# CHECK-NEXT:         Type:            0x000000FF
+# CHECK-NEXT: Symbols:
+# CHECK-NEXT: ...
+
+!ELF
+FileHeader:
+  Class:           ELFCLASS32
+  Data:            ELFDATA2LSB
+  Type:            ET_REL
+  Machine:         EM_386
+Sections:
+  - Type:            SHT_PROGBITS
+    Name:            .text
+    Flags:           [ SHF_ALLOC, SHF_EXECINSTR ]
+    AddressAlign:    0x04
+    Content:         0000000000000000
+  - Type:            SHT_REL
+    Name:            .rel.text
+    Link:            .symtab
+    Info:            .text
+    AddressAlign:    0x04
+    Relocations:
+      - Offset:          0
+        Symbol:          main
+        Type:            0xFF