diff --git a/include/llvm/BinaryFormat/ELF.h b/include/llvm/BinaryFormat/ELF.h
index b5664990e5d..8fb1e87661f 100644
--- a/include/llvm/BinaryFormat/ELF.h
+++ b/include/llvm/BinaryFormat/ELF.h
@@ -1305,7 +1305,7 @@ enum {
 };
 
 // Property types used in GNU_PROPERTY_TYPE_0 notes.
-enum {
+enum : unsigned {
   GNU_PROPERTY_STACK_SIZE = 1,
   GNU_PROPERTY_NO_COPY_ON_PROTECTED = 2,
   GNU_PROPERTY_X86_FEATURE_1_AND = 0xc0000002